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Batman: Arkham Knight: Batman: Arkham Knight 100% Completion Guide

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The seismic activity and the Port Adams subway

The last bomb rioter in Bristol, a battle at the Botanical Gardens, a return to Airship Beta, then Port Adams and the Subway under Founders' Island, with every Subway item on the way through.

You finish the last bomb rioter, then the story runs on with few stops. You carry the Remote Hacking Device, Disruptor, Remote Electrical Charge, Freeze Blast, Line Launcher and Voice Synthesizer, with the Power Winch, Forensics Scanner, EMP and Sonar on the Batmobile. Part-way through, gas covers the streets, and all side content waits until it lifts in the next section. Nothing is lost by waiting: every Riddler challenge and Most Wanted mission stays open, so during the gas the route does the story and only the Riddler items on its path. Left for later: the Port Adams yard items and one Airship Beta trophy, which need the gas gone.

Bomb rioter: Salvation Bridge overpassCollectible
Location
Miagani Island · Bristol – The last rioter is at the Miagani end of Salvation Bridge. Climb to the plate on the metal overpass with the road signs, joining two buildings above the road (3109, 1898). Fly a Remote Controlled Batarang over the street below until he is tagged. There is no live current here to charge a Batarang, so hit him with the Remote Electrical Charge.
Requires
Summary
One of the Riddler's six bomb rioters, each a single challenge, kept for both runs.
Sources
Report an issue
Investigate the seismic activity on MiaganiQuest step
Location
Miagani Island · Grand Avenue – Set the main story on the mission wheel and drive to the marker in the centre of Miagani, on Grand Avenue. Clear any tanks around it, then park on the marked spot. A short scene runs, and a Batmobile battle starts a few seconds later.
Requires
Summary
The main story picks up again with strange tremors under Miagani Island.
Sources
Report an issue
Stop the enemies attacking the Botanical GardensHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Miagani Island · Botanical Gardens – The first wave is all tanks, among them the new Twin Rattlers with their double armour. Dodge the targeting beams, fire the Missile Barrage whenever it charges, and stay close to the gardens, where roots destroy some tanks for you. Five Cobras follow: take them one at a time from behind, hiding between kills. The trophy pops with the last Cobra.
Requires
Summary
A long Batmobile defence of the gardens, with a trophy at the end of it.
Trophies
  • Achievement · SteamCity of Fear
  • Achievement · XboxCity of Fear
  • Bronze · PlayStationCity of Fear
Sources
Report an issue
Don't quit straight after this scene

The same reported bug as before: saving and quitting right after this Ivy scene can grey out the AR maps City Heat TT and Under the Pale Moonlight, so play on to the next autosave first.

Talk to Ivy at the Botanical Gardens treeHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Miagani Island · Botanical Gardens – Follow the marker back to the gardens, leave the Batmobile and go on foot to the top level. Interact with the marked tree for a long scene. You come out of it on foot, with gas over the streets and the Batmobile stranded in it on Grand Avenue.
Requires
Summary
A scene that changes the streets for the next stretch of the story.
Sources
Report an issue
Side content waits until the gas lifts

From here until the gas clears, play only the story and the items listed. Nothing is lost by waiting: every Riddler challenge and Most Wanted mission will still be there afterwards. Stay on the rooftops. Dropping into the gas does no harm, but Batman just grapples back up to the nearest high point, and the mini-map is out.

Glide and grapnel over the rooftops to the airships above Founders', blinding any flying drones that get close. Climb the crane opposite Airship Beta's wrecked front and glide in; beat the Medic first and the shield Brute last. The door at the back wants Stagg's voice, so tune the Voice Synthesizer's two sliders until the sample is clear and use it on the panel (with a sample already taken, the door simply opens).

Interrogate Simon Stagg on Airship BetaHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Stagg Airships · Airship Beta: Biological Engineering – Through the voice door, Biological Engineering is a predator room: clear the two Boa Drones and their crew, starting with the Medics. Then scan the small glass cell in Detective Mode and follow the handprints to a hatch near the chimpanzee cage, and open it.
Requires
Summary
Back to the wrecked airship to find an answer to the gas. It ends with the Nimbus Power Cell.
Sources
Report an issue
Riddler trophy: voice door, Biological EngineeringCollectible
Location
Stagg Airships · Airship Beta: Biological Engineering – Stay in this room. Go to the north-east corner of its lowest level and open the voice-locked door with the Voice Synthesizer. The trophy is inside.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Riddler trophy: airlock lights, Subject TestingCollectible
Location
Stagg Airships · Airship Beta: Subject Testing – Backtrack to Subject Testing and follow the curved walkway to two Sentry Guns aimed at a shutter. Open the shutter with the Voice Synthesizer and tilt the ship with the Airship Stability Controls, so the crate behind it slides out and crushes the guns. In the room past them, open the airlock with its control and stand on the plate. Five lights run along Airship Alpha's side: fly a Remote Controlled Batarang into the right-most one as it lights up.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Send the Subject Testing crate overboardQuest step
Location
Stagg Airships · Airship Beta: Subject Testing – Back at the Airship Stability Controls, tilt the crate to where it started, then tilt the other way and keep ramming it into the window until it smashes through and falls. If the first tilt already sent it out of the ship, this is done. It stays where it lands, and you collect it once the gas has gone.
Requires
Summary
The crate that crushed the guns holds another trophy, and it can't be opened up here. Dropping it to the city is the only way to get it.
Sources
Report an issue
Use the Nimbus Power Cell to repair the BatmobileQuest step
Location
Miagani Island · Grand Avenue – Go back to Beta's wrecked front. A Dragon drone now patrols there: blind it with the Remote Hacking Device and glide out. Fly to the marked roof on Grand Avenue, above the Batmobile, and press the prompt to drop in. Ease the old core out and the new one in very slowly, stopping whenever the lights turn yellow, and counter the attacker when the icon shows.
Requires
Summary
Puts the Batmobile back on the road, and lets it drive through the gas.
Sources
Report an issue
Find Ivy's plant by Divinity ChurchHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Founders' Island · Drescher – With the mini-map out, follow the GPS route on the road to Founders'. There, go into Battle Mode and fire the Sonar: the roots show as white lines leading to a red dot in the graveyard at Divinity Church (2420, 1912). Park over the dot and hold the Sonar button for a blast. It fails, because the plant lies too deep, and the story sends you underground.
Requires
Summary
The next plant is on Founders' Island, and the repaired Batmobile can now reach it.
Sources
Report an issue
Gain access to the subway network at Port AdamsQuest step
Location
Founders' Island · Port Adams – Follow the GPS to Port Adams (2945, 1450), park on the marked spot and wait for the gate. Fight tanks and flying Dragons round the yard, staying out of the red circles and leaving the missile launcher for last. Then hit the yellow ramp facing the centre with the Afterburner, jump the fence and win a second fight among the containers. Winch the marked door down, winch the elevator control inside and hold the revs in the orange to ride down. If the elevator won't move, drive in again and park in a different spot.
Requires
Summary
Port Adams finally opens to the Batmobile, with two big tank battles before the Subway. Buy any Batmobile armour you can first.
Sources
Report an issue
Breakable: militia shield, above the fansCollectible
Location
Founders' Island · Subway – As you come off the lift into the first Subway room, look to your right and up. The shield is high on the wall above three spinning fans: break it with the 60mm Cannon.
Requires
Summary
A militia shield, one of the 90 breakable objects: five of them make one Riddler challenge.
Sources
Report an issue
Riddler trophy: office desk, first Subway roomCollectible
Location
Founders' Island · Subway – Still in the first room, grapnel to the catwalk overhead and on to the roof of the control room high in the corner. Drop through the hole in its roof: the trophy is on the desk.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Subway: crawl under the security doorQuest step
Location
Founders' Island · Subway – Drive up the wall of the phase 1 tunnel to loop over the barrier and the gate in the floor, and stop at the locked security door. Get out, drop into the floor grate just before it and crawl to the far end. Blind the Rattler in front of the exit with the Remote Hacking Device, climb out and walk past it. Only one tank can be blinded at a time, so blind each one as you need it.
Requires
Summary
The car can't pass the security door, so you go on alone on foot.
Sources
Report an issue
Riddler trophy: side passage, phase 3 tunnelCollectible
Location
Founders' Island · Subway – Carry on down the phase 3 tunnel, blinding the patrolling Rattler as it nears you. Halfway along, a side passage holds a third Rattler, parked. Take cover at the corner, blind it and step past: the trophy is behind it on the collapsed yellow lift.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Subway: pull the office leverQuest step
Location
Founders' Island · Subway – Further down, four more Rattlers are parked in your way. Blind the nearest, or Batclaw up to the supports overhead, and slip into the small office beyond them. Pull its red lever: the gate opens and the view switches to Remote Batmobile Control. Loop the car over the barrier and destroy the Rattlers.
Requires
Summary
Opens the security gate, so the Batmobile can come through to you.
Sources
Report an issue
Subway: open the gate into the phase 4 tunnelQuest step
Location
Founders' Island · Subway – Rejoin the car, then use the lever at the next gate, ahead of the Rattlers you destroyed, to open the way into the phase 4 tunnel.
Requires
Summary
Puts you back in the Batmobile for the rest of the Subway.
Sources
Report an issue
Breakable: militia shield, start of the phase 4 tunnelCollectible
Location
Founders' Island · Subway – Drive a short way into the phase 4 tunnel and look up on your right. The shield is on a sealed circular doorway, before the first ramp.
Requires
Summary
A militia shield, one of the 90 breakable objects: five of them make one Riddler challenge.
Sources
Report an issue
Breakable: militia shield, looking back past the first rampCollectible
Location
Founders' Island · Subway – Grapnel to the control room ahead, where the phase 5 tunnel starts, and work the Cargo Ramp controls to make the ramp usable. Drive up it and through the narrowing stretch, past the City Vision Construction logo. Stop at the next barrier and turn round: the shield is above the way you came.
Requires
Summary
A militia shield, one of the 90 breakable objects: five of them make one Riddler challenge.
Sources
Report an issue
Riddler trophy: roof of the second ramp's control roomCollectible
Location
Founders' Island · Subway – Loop over the barrier along the tunnel roof, then loop over the hole with the water below it. Through the phase 6 tunnel you reach a second Cargo Ramp, with its control room across the gap. Grapnel over and climb onto that room's roof for the trophy.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Riddler trophy: walkway over the subway stationCollectible
Location
Founders' Island · Subway – Set the ramp first: press the switch in the control room once, park the car on the ramp's raised end by remote so it tips down, and press the switch again to lock it. Return to the car, take a run-up, jump the gap with the Afterburner and drive up the stairs into the station. At its far end, before you break any wooden wall, grapnel to the walkway right above you.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Hold the Sonar blast for now

Don't use the Sonar in the cave yet. Finding the plant lifts you straight back to the surface, and the last Subway items would then need another trip down the Port Adams elevator. Take the next five items first.

Riddler trophy: beside the wooden rampCollectible
Location
Founders' Island · Subway – Three wooden walls block the end of the station. Smash the one on your left, drive up to the wooden ramp behind it and stop before you go off the edge. The trophy is to the right of the ramp.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Breakable: militia shield, cave wallCollectible
Location
Founders' Island · Subway – Now work clockwise round the cave. Drive ahead into the three-way junction and look high on the wall behind the big rock, near a blue light, for the shield.
Requires
Summary
A militia shield, one of the 90 breakable objects: five of them make one Riddler challenge.
Sources
Report an issue
Riddler trophy: railed ledge, drainage roomCollectible
Location
Founders' Island · Subway – Keep driving into the drainage room with the brick walls and barred culverts. Grapnel to the ledge with a railing on the north side of the room.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Riddler trophy: chair by the excavatorCollectible
Location
Founders' Island · Subway – Drive on into the next cave, which is under construction. Beside the excavator, go up the short flight of stairs: the trophy sits on a chair.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Riddler trophy: support beam above the excavatorCollectible
Location
Founders' Island · Subway – In the same cave, grapnel up the walkways overhead to the very top. The trophy is on one of the support beams.
Requires
Summary
One of the Riddler's 243 challenges, collected once and kept for both runs.
Sources
Report an issue
Cross the subway tunnels and release the plantHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Founders' Island · Subway – All twelve Subway items are done. Get back in the Batmobile, go into Battle Mode and fire the Sonar, following the roots to the red dot at their centre. Hold the Sonar button for the blast, and a scene lifts you back to the surface.
Requires
Summary
The end of the Subway run: the Sonar blast reaches the roots at last.
Sources
Report an issue
Protect Poison Ivy and her plantsHidden spoiler – activate to revealQuest stepMinor spoiler
Location
Founders' Island · Drescher – You surface at the Divinity Church churchyard with about forty machines closing in, including Dragons and a missile launcher. Stay near the church, where Ivy's plants destroy some of them for you. Shoot down rockets and Dragons with the Vulcan Gun, kill the Mambas as soon as they show, and leave the launcher until most of the rest are gone. A scene ends it.
Requires
Summary
The biggest tank battle yet, and the end of this stretch.
Sources
Report an issue
Fear Multi-Takedown x5Upgrade
Location
Founders' Island · WayneTech menu – Buy this in the WayneTech upgrades menu, on the Batsuit list, as soon as you can afford it. It comes after Fear Multi-Takedown x4 and can be bought wherever you are, but have it before your next visit to Panessa Studios.
Requires
Summary
The last step of the Fear Multi-Takedown upgrade. A Panessa Studios trophy needs it: five robots down inside five seconds.
Sources
Report an issue

About this guide

Two playthroughs. Run 1 on Normal or Hard does the story, every Most Wanted mission, Season of Infamy, all 243 Riddler challenges and the Knightfall Protocol, with free roam still open afterwards. Run 2 is New Story+, played on Knightmare, for the main missions and Blunt Trauma. The Arkham Episodes, A Matter of Family and the AR challenges come last.

Last verified: Nov 5, 2026 · Patch PS4, Xbox One and Steam, latest patch, with all DLC · 0 community corrections shipped

Unofficial fan guide. Not affiliated with the publisher.