Stop the unstoppable
Last man standing
Clear the airwaves
Solve the first riddle
Drop in on an old friend
Hammer the point home
There is only one way in
Answer a ringing phone
Save the medical volunteers
Save the damsel, but is she in distress?
Become the Bat
Reach Level 55
Complete story mode on Normal difficulty
Complete story mode on Easy difficulty
Defeat the giant Titan Ivy plant
Ride Titan henchman and knock down 10 thugs (any play mode)
Venture into Killer Croc's lair and come out alive
Conquer the effects of the Scarecrow's fear gas
Defeat two Titan Henchmen at once
Solve 25% of Riddler challenges
Capture and lock up Harley Quinn
Save Dr. Young from being killed by Victor Zsasz
Face your biggest fears and keep your sanity
Gain access to Arkham Mansion after it is locked down by the Joker
Solve 10% of Riddler challenges
Defeat Bane
Survive the nightmare of the Scarecrow's fear gas
Save all the doctors in Medical
Solve 5% of Riddler challenges
Successfully Exfil in MWZ
Complete a combo of 20 moves (any play mode)
Escape from Intensive Treatment to the island surface
Complete a combo of 10 moves (any play mode)
Survive the onslaught from the deformed Joker henchman
Rescue the guards and henchman from the Joker toxin in Decontamination
Take down Zsasz in the Patient Pacification Chamber
Complete a combo of 5 moves (any play mode)
Kill 12 enemies while descending in the panopticon in 'Operation 627'
Cure a zombie villager.
Gain the trust of an Ocelot.
Dig up a buried treasure
Halo 2: Beat the par score on The Great Journey.
Halo 2: Complete every level of the game on Normal difficulty.
Kill 1000 Brutes.
Halo 2: Activate Terminal 11 on Uprising.
Halo 2: Beat the par score on Gravemind.
Halo 2: Activate Terminal 10 on Gravemind.
Halo 2: Activate Terminal 9 on Quarantine Zone.
Halo 2: Drive a Scorpion while playing as the Arbiter.
Halo 2: Beat the par score on Delta Halo.