ACHIEVEMENT - HOW TO UNLOCK
Big Bang (50 points) - Complete story mode on Easy difficulty.
Bigger Bang (50 points) - Complete story mode on Normal difficulty.
Biggest Bang (50 points) - Complete story mode on Hard difficulty.
Party Pooper (10 points) - Time to break up this party.
Freeflow Combo 20 (10 points) - Complete a combo of 20 moves (any play mode).
Freeflow Combo 40 (10 points) - Complete a combo of 40 moves (any play mode).
Night Glider (5 points) - Glide continuously for over 100m.
Rope-A-Dope-A-Dope (10 points) - String up one henchman and drop him to surprise a second (any play mode).
Mano-A-Mano (10 points) - Take on a beast in hand to hand combat.
Catch! (5 points) - Catch a Batarang (any play mode).
Freeflow Combo 5 (5 points) - Complete a combo of 5 moves (any play mode).
Freeflow Combo 10 (5 points) - Complete a combo of 10 moves (any play mode).
Freeflow Perfection (10 points) - Perform a perfect combo including all of Batman's combat moves (any play mode).
Freakshow Rodeo (10 points) - Ride a beast and unleash its power.
Freeflow Bronze (10 points) - Achieve 8 medals on combat challenges.
Freeflow Silver (25 points) - Achieve 16 medals on combat challenges.
Freeflow Gold (50 points) - Achieve 24 medals on combat challenges.
Predator Bronze (10 points) - Achieve 8 medals on predator challenges.
Predator Silver (25 points) - Achieve 16 medals on predator challenges.
Predator Gold (50 points) - Achieve 24 medals on predator challenges.
Invisible Predator (10 points) - Complete one predator challenge by using only Silent Takedowns and without being detected.
Flawless Freeflow Fighter (10 points) - Complete one combat challenge without taking damage.
Crack The E Nigma (20 points) - Solve every riddle on the island.
Arkham Analyst (20 points) - Solve 5% of Riddler challenges.
Cryptic Investigator (20 points) - Solve 10% of Riddler challenges.
Lateral Thinker (20 points) - Solve 25% of Riddler challenges.
Mystery Solver (20 points) - Solve 40% of Riddler challenges.
Conundrum Cracker (20 points) - Solve 55% of Riddler challenges.
Mental Athlete (20 points) - Solve 70% of Riddler challenges.
Riddle Resolver (20 points) - Solve 85% of Riddler challenges.
World's Greatest Detective (20 points) - Solve Arkham's biggest mystery.
Perfect Knight (75 points) - 100% Complete.
Additionally there are fifteen secret achievements.
Shocking Rescue (10 points) - Take down Zsasz in the Patient Pacification Chamber.
Leave No Man Behind (10 points) - Rescue the guards and henchman from the Joker toxin in Decontamination.
Malpractice Needs More Practice (10 points) - Survive the onslaught from the deformed Joker henchman.
Born Free (10 points) - Escape from Intensive Treatment to the island surface.
Just What The Doctors Ordered (10 points) - Save all the doctors in Medical.
Daydreamer (10 points) - Survive the nightmare of the Scarecrow's fear gas.
Baneful Payback (25 points) - Defeat Bane.
Breaking And Entering (10 points) - Gain access to Arkham Mansion after it is locked down by the Joker.
Recurring Nightmare (10 points) - Face your biggest fears and keep your sanity.
Zsasz Cut Down To Size (10 points) - Save Dr. Young from being killed by Victor Zsasz.
Solitary Confinement (25 points) - Capture and lock up Harley Quinn.
Double Trouble (25 points) - Defeat two Titan Henchmen at once.
Resist The Fear (50 points) - Conquer the effects of the Scarecrow's fear gas.
Crocodile Tears (50 points) - Venture into Killer Croc's lair and come out alive.
Poisoned Ivy (50 points) - Defeat the giant Titan Ivy plant.