xbox 360-Batman: Arkham Asylum

Achievements

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

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:

Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (50 points): Unknown.
Secret achievement (50 points): Unknown.
Secret achievement (50 points): Unknown.