In Mob of the Dead, survive an entire round on the bridge on round 15 or higher.

In Mob of the Dead, convert a weapon using a kit.

Defeat two Titan Henchmen at once

Capture and lock up Harley Quinn

Save Dr. Young from being killed by Victor Zsasz

Complete a combo of 10 moves (any play mode)

Solve 5% of riddler challenges

Survive the nightmare of the Scarecrow's fear gas

Escape from Intensive Treatment to the island surface

In Buried, acquire a perk for free.

In Origins, build all elemental staffs in one game.

In Origins, activate all generators without allowing one to stop.

Escape 15 police chases