Conquer the effects of the Scarecrow's fear gas

Locate room 899

Hide a body

Achieve the rating: Silent Assassin

Unlock a technique

Achieve your first accident kill

Contain a situation gone bad

Achieve a lethal throw kill

Defeat two Titan Henchmen at once

Save Dr. Young from being killed by Victor Zsasz

Gain access to Arkham Mansion after it is locked down by the Joker

Solve 10% of Riddler challenges