Big Bang (50) Complete story mode on Easy difficulty
Bigger Bang (50) Complete story mode on Normal difficulty
Biggest Bang (50) Complete story mode on Hard difficulty
Party Pooper (10) Time to break up this party
Freeflow Combo 20 (10) Complete a combo of 20 moves (any play mode)
Freeflow Combo 40 (10) Complete a combo of 40 moves (any play mode)
Night Glider (5) Glide continuously for over 100m
Rope-A-Dope-A-Dope (10) String up one henchman and drop him to surprise a second (any play mode)
Mano-A-Mano (10) Take on a beast in hand to hand combat
Catch! (5) Catch a Batarang (any play mode)
Freeflow Combo 5 (5) Complete a combo of 5 moves (any play mode)
Freeflow Combo 10 (5) Complete a combo of 10 moves (any play mode)
Freeflow Perfection (10) Perform a perfect combo including all of Batman's combat moves (any play mode)
Freakshow Rodeo (10) Ride a beast and unleash its power
Freeflow Bronze (10) Achieve 8 medals on combat challenges
Freeflow Silver (25) Achieve 16 medals on combat challenges
Freeflow Gold (50) Achieve 24 medals on combat challenges
Predator Bronze (10) Achieve 8 medals on predator challenges
Predator Silver (25) Achieve 16 medals on predator challenges
Predator Gold (50) Achieve 24 medals on predator challenges
Invisible Predator (10) Complete one predator challenge by using only Silent Takedowns and without being detected
Flawless Freeflow Fighter (10) Complete one combat challenge without taking damage
Crack The E Nigma (20) Solve every riddle on the island
Arkham Analyst (20) Solve 5% of Riddler challenges
Cryptic Investigator (20) Solve 10% of Riddler challenges
Lateral Thinker (20) Solve 25% of Riddler challenges
Mystery Solver (20) Solve 40% of Riddler challenges
Conundrum Cracker (20) Solve 55% of Riddler challenges
Mental Athlete (20) Solve 70% of Riddler challenges
Riddle Resolver (20) Solve 85% of Riddler challenges
World's Greatest Detective (20) Solve Arkham's biggest mystery
Perfect Knight (75) 100% Complete

Secret Achievements

Shocking Rescue (10) Take down Zsasz in the Patient Pacification Chamber
Leave No Man Behind (10) Rescue the guards and henchman from the Joker toxin in Decontamination
Malpractice Needs More Practice (10) Survive the onslaught from the deformed Joker henchman
Born Free (10) Escape from Intensive Treatment to the island surface
Just What The Doctors Ordered (10) Save all the doctors in Medical
Daydreamer (10) Survive the nightmare of the Scarecrow's fear gas
Baneful Payback (25) Defeat Bane
Breaking And Entering (10) Gain access to Arkham Mansion after it is locked down by the Joker
Recurring Nightmare (10) Face your biggest fears and keep your sanity
Zsasz Cut Down To Size (10) Save Dr. Young from being killed by Victor Zsasz
Solitary Confinement (25) Capture and lock up Harley Quinn
Double Trouble (25) Defeat two Titan Henchmen at once
Resist The Fear (50) Conquer the effects of the Scarecrow's fear gas
Crocodile Tears (50) Venture into Killer Croc's lair and come out alive
Poisoned Ivy (50) Defeat the giant Titan Ivy plant
Source(s):
xbox360achievements.org

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