Alternate Costumes...
	Batgirl: A Matter of Family: S...
	DC Universe References...
	Different Ending...
	GCPD Evidence Locker...
	I Am The Night Mode...
	New Story + Mode...
	Solomon Grundy Room...
	Superman References...
	The Dark Knight Coaster Refere...
	The Ghost in Gray...
	Train Station Posters...
	Various Steam Achievements...

When the indicated requirement is met the corresponding costume will become unlocked.

Adam West:
PlayStation exclusive pre-order bonus; available to ALL Season Pass owners in Fall 2015.

Anime Batman:
Sign into the game with a WBPlay account.

Batman 1st Appearance:
Amazon pre-order bonus; or included in Serious Edition.

Batsuit v.7.43:
Available by default.

Batsuit v.8.03:
Progress through the storyline.

Flashpoint:
Included in Premium Edition or ALL Season Pass.

New 52:
Free DLC costume.

The Dark Knight Returns:
Included in Gotham's Future Skin Pack on Steam.

Achievement	How to unlock
A Blade of Memory	Destroy all Teeth, Balloons and Jack-In-The-Boxes.
A Courtship of Razors	Rescue your father.
A Fire in the Heavens	Free the hostages at the Ferris Wheel.
A House Made of Spun Glass	Free the hostages at the Merry-go-round.
All Snug in Their Beds	Uncover the secret history of the park.
Ambush	Defeat 4 enemies within the duration of a single scare effect.
The Laughing Fish!	Free the hostages at the Ghost Ship.
Weird War Tales	Defeat 15 enemies using any type of hacking.

Throughout the game, many of the thugs Batman encounters will discuss other cities and heroes in the DC universe, including Metropolis, Bludhaven, Keystone and Central City. There are also several buildings owned by other DC heroes and villains.

Catwoman makes reference to having burgled Queen Industries, which is the large corporation owned by Oliver Queen - A.K.A. Green Arrow.

There are several billboards advertising vacation packages to Santa Prisca, which is the home country of the villain Bane. Many Militia members can also be heard referencing the South American country.

Other thugs reference the fact that Gotham beats out Keystone because you can at least see Batman coming, unlike The Flash, who hails from Keystone.

If you capture fourteen of Gotham's most ended at the end of the game, you'll get a different ending than you will if you settle for the mere seven that are technically required.

When in the GCPD, Batman can view the Evidence Locker, which contains weapons an gear confiscated by villains throughout Batman's adventures in Arkham Origins (note elsewhere also the references to the Blackgate Riots that took place during that game), Arkham Asylum, and Arkham City - all of which have voice recordings from Aaron Cash. You can find Talia's sword in the Evidence Locker, and inspecting it will cause Batman to have a private moment of reflection. Any additional enemies apprehended during the course of Arkham Knight will see their weapons and items added to the Evidence Locker.

Clear New Game+ Mode and you'll gain access to a new one: I Am the Night.

When you complete the game under the Normal or higher difficulty setting the 'New Story +' option will become unlocked at the 'Main' menu. In New Story + mode you will retain your WayneTech upgrades and experience points and you will play under the Knightmare difficulty setting.

Consult the map of Gotham and travel to the coordinates 2208, 1851. You'll find a door you can enter to reach a room with a Gramophone playing a recording of the poem of Solomon Grundy.

Superman has been one of Batman's best allies and greatest foes throughout his career as the "World's Greatest Detective." In Arkham Knight, many in-game items refer to the line between the Man of Steel and the Dark Knight.

Listen to Bruce's answering machine in Wayne Tower to hear several messages from Lex Luthor, who is interested in purchasing the Applied Sciences division of Wayne Enterprises - apparently Bruce has been avoiding his calls. Scattered all over Gotham are billboards for the mega-corporation that serves as the main infrastructure for Clark Kent's nemesis Lex Luthor. Several thugs can be heard lamenting the state of Gotham, adding that all it needs now is for a certain caped freak to come flying in.

Play through the Batgirl DLC (released as "A Matter of Family") until you reach a point where you head underground, shortly after rescuing two officers who were drowning. Look for a room with two boxes on top of each other. They have a "2008 05 15" label on them. This date is a reference to the date when the Dark Knight Coaster opened to the public in the Six Flags theme park.

In several areas of the game like Oracle's Clock Tower and Panessa Studios, posters can be seen for The Gray Ghost. This is a reference to the Batman Animated Series episode "Beware the Gray Ghost," where Batman must solve a crime spree reminiscent of an old TV show who's main hero (voiced by Adam West) operated much like Batman.

Head to the train station located near Grand Avenue. Look around to find posters that advertise travel destinations. These include Keystone City (home of The Flash), Metropolis (Superman's home). Look closely at the artwork promoting those destinations and you'll see the heroes on display.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Battle Within	Fight for your sanity.
A Blade of Memory	Destroy all Teeth, Balloons and Jack-In-The-Boxes.
A Courtship of Razors	Rescue your father.
A Fire in the Heavens	Free the hostages at the Ferris Wheel.
A Heart Broken in Two	Secure the secret base.
A House Made of Spun Glass	Free the hostages at the Merry-go-round.
A Leap of Faith	Complete 8 different jumps over 100 meters.
Absolution	Achieve 69 Stars in AR Challenges.
All Snug in Their Beds	Uncover the secret history of the park.
Ambush	Defeat 4 enemies within the duration of a single scare effect.
Angel in the Dark	Complete the trials and prove you are a worthy successor.
As the Crow Flies	Escape from ACE Chemicals.
Be Not Afraid	Win the war for Gotham.
Beautiful Boy	Destroy the second weapons cache in Gotham City.
Blind Love	Destroy the third weapons cache in Gotham City.
Blunt Trauma	Perform every type of predator takedown.
Brotherhood of the Fist	Return of the Dynamic Duo.
Brutality 101	Perform 15 different combat moves in one FreeFlow.
Choice of Weapons	Use all five Batmobile weapons successfully in one tank battle.
City of Fear	Defend the assault on your ally's fortress.
Cold World	Destroy the first weapons cache in Gotham City.
Creature of the Night	Freedom of the city.
Cuckoo for Incarceration	Rescue your friend.
Cycle of Violence	Use 100 Quick Gadgets while in free flow combat.
Dark Allegiances	Apprehend Scarecrow's senior commander.
Dark Wings Fly Away in Fear	What is the Cloudburst?
Days of Fire	Extinguish the fires in Gotham City.
Death and Glory	Take out 20 thugs with fear takedowns.
Death by Design	Obtain a key by completing the seventh Riddler trial.
Death of Innocents	Rescue station 17 fire crew.
Dirty Tricks	Achieve 3 minutes of drifting time in the Batmobile.
Double Jeopardy	Face off with an old friend.
Fear of Faith	Rescue the ACE Chemical workers.
Fear of Success	Survive Scarecrow's ambush.
Fortunate Son	Achieve 46 Stars in AR Challenges.
Gates of Gotham	Destroy all of the militia watchtowers.
Gotham After Midnight	Glide for 400 meters while less than 20 meters from the ground.
Gotham Underground	Defuse all of the militia explosive ordinance in Gotham City.
Jekyll & Hyde	Stop the bank heist on Miagani Island and lock up the master mind in GCPD.
Journey into Knight	Even The Odds.
Judgment Day	Win the rumble down under.
Knightfall	Initiate Knightfall Protocol.
Lethal Pursuits	Obtain a key by completing the ninth Riddler trial.
Living Hell	Interrogate the Militia APC Driver.
Master of Fear	Wayne vs Crane.
Nine Lives	Obtain a key by completing the last Riddler trial.
No Man's Land	Restore power to the bridges of Gotham City.
Pieces of the Puzzle	Obtain a key by completing the second Riddler trial.
Point of Impact	Perform 5 perfect shots in a row with the Vulcan Gun without taking damage.
Practice Run	Destroy the fourth weapons cache in Gotham City.
Riddle Me That	Lock up the Riddler in GCPD.
Riddler on the Rampage	Obtain a key by completing the fourth Riddler trial.
Run Through the Jungle	Fly under 3 main bridges between the islands in one continuous glide.
Savage Metal	Smash 10 militia transport vehicles off the road without using the immobilizer.
Scar of the Bat	Cure the doctor.
Seduction of the Gun	Achieve 50 critical shots on light tanks.
Sins of Youth	Achieve 23 Stars in AR Challenges.
Strange Deadfellows	Deploy the Cloudburst countermeasures.
Streets of Gotham	Destroy all of the militia checkpoints.
The Burning Question	Obtain a key by completing the fifth Riddler trial.
The Cat and the Bat	Obtain a key by completing the third Riddler trial.
The Cult	Save the sacrificial victim and lock up the executioner in GCPD.
The Frequency of Fear	Scan Gotham City to pinpoint Scarecrow's location.
The Laughing Fish!	Free the hostages at the Ghost Ship.
The Long Halloween	Wayne vs Crane in New Story +.
The Monster Machine	Track down and apprehend the serial killer.
The Primal Riddle	Obtain a key by completing the sixth Riddler trial.
The Real Deal	Takedown 20 moving cars without using the Batmobile.
The Riddle Factory	Obtain a key by completing the eighth Riddler trial.
The Road Home	Destroy all of the militia APC's.
The Road to Hell	Successfully complete the first Riddler trial.
Touch of Death	Apprehend the weapons dealer and lock him up in GCPD.
Trail of Fear	Lock up your first Supervillain in GCPD.
Two Faces of Fear!	Stop the bank heist on Bleake Island.
Two Sides of the Same Coin!	Stop the bank heist on Founders' Island.
Under The Red Hood	Shut down this operation.
Weird War Tales	Defeat 15 enemies using any type of hacking.
Who Rules The Night	Batman vs the Arkham Knight.
With a Vengeance!	Take on the heavy artillery reinforcements.