Venture into Killer Croc's lair and come out alive

Defeat two Titan Henchmen at once

Capture and lock up Harley Quinn

Face your biggest fears and keep your sanity

Gain access to Administration after it is locked down by the Joker

Solve 10% of riddler challenges

Save all the doctors in medical

Escape from Intensive Treatment to the island surface

Survive the onslaught from the deformed Joker henchman

Take down Zsasz in the Patient Pacification Chamber

Destroy all 18 of the Score stars found throughout "Lost in Nightmares."

Complete "Desperate Escape" with an S rank.

Obtain all treasures in the game.