Save Dr. Young from being killed by Victor Zsasz

Solve 10% of riddler challenges

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

Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.

Reach 80% of your stronghold's total value.

Unlock all 20 pieces of Subject 16's video.

Survive the nightmare of the Scarecrow's fear gas

Solve 5% of riddler challenges

Survive the onslaught from the deformed Joker henchman

Take down Zsasz in the Patient Pacification Chamber

Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.

Earn 4 stars in Special Ops.

Complete the Single Player campaign on any difficulty.