Defeat two Titan Henchmen at once
Unlocked: 20 Feb 2011 14:41:14
Solve 55% of Riddler challenges
Unlocked: 20 Feb 2011 14:27:33
Capture and lock up Harley Quinn
Unlocked: 18 Feb 2011 20:30:46
Solve 40% of Riddler challenges
Unlocked: 18 Feb 2011 20:00:41
Save Dr. Young from being killed by Victor Zsasz
Unlocked: 18 Feb 2011 19:36:17
Face your biggest fears and keep your sanity
Unlocked: 18 Feb 2011 19:29:15
Gain access to Arkham Mansion after it is locked down by the Joker
Unlocked: 17 Feb 2011 19:53:35
Glide continuously for over 100m
Unlocked: 17 Feb 2011 19:51:09
Solve 25% of Riddler challenges
Unlocked: 17 Feb 2011 19:49:57
Defeat Bane
Unlocked: 17 Feb 2011 15:26:02
Survive the nightmare of the Scarecrow's fear gas
Unlocked: 17 Feb 2011 15:14:02
Save all the doctors in Medical
Unlocked: 16 Feb 2011 20:23:24
String up one henchman and drop him to surprise a second (any play mode)
Unlocked: 16 Feb 2011 19:52:45
Solve 10% of Riddler challenges
Unlocked: 16 Feb 2011 19:52:04
Escape from Intensive Treatment to the island surface
Unlocked: 16 Feb 2011 19:28:24
Solve 5% of Riddler challenges
Unlocked: 15 Feb 2011 21:29:13
Survive the onslaught from the deformed Joker henchman
Unlocked: 15 Feb 2011 20:57:14
Complete a combo of 10 moves (any play mode)
Unlocked: 15 Feb 2011 20:39:37
Rescue the guards and henchman from the Joker toxin in Decontamination
Unlocked: 15 Feb 2011 17:27:45
Take down Zsasz in the Patient Pacification Chamber
Unlocked: 15 Feb 2011 17:20:18
Complete a combo of 5 moves (any play mode)
Unlocked: 15 Feb 2011 17:11:47
Conquer the effects of the Scarecrow's fear gas
Venture into Killer Croc's lair and come out alive
Defeat the giant Titan Ivy plant
Big Bang
50Complete story mode on Easy difficulty
Bigger Bang
50Complete story mode on Normal difficulty
Biggest Bang
50Complete story mode on Hard difficulty
Party Pooper
10Time to break up this party
Complete a combo of 20 moves (any play mode)
Complete a combo of 40 moves (any play mode)
Mano-A-Mano
10Take on a beast in hand to hand combat
Catch!
5Catch a Batarang (any play mode)
Perform a perfect combo including all of Batman's combat moves (any play mode)
Ride a beast and unleash its power
Achieve 8 medals on combat challenges
Achieve 16 medals on combat challenges
Achieve 24 medals on combat challenges
Achieve 8 medals on predator challenges
Achieve 16 medals on predator challenges
Achieve 24 medals on predator challenges
Complete one predator challenge by using only Silent Takedowns and without being detected
Complete one combat challenge without taking damage
Solve every riddle on the island
Solve 70% of Riddler challenges
Solve 85% of Riddler challenges
Solve Arkham's biggest mystery
100% Complete