Collect enough evidence to locate the gun for hire

Get a 2X Multiplier

Complete all levels in The Gardens

Escape from Intensive Treatment to the island surface

Solve 25% of riddler challenges

Solve 10% of riddler challenges

Complete a combo of 5 moves (any play mode)

String up one henchman and drop him to surprise a second (any play mode).

Place a sticker

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

Defeat two Titan Henchmen at once

Survive the onslaught from the deformed Joker henchman

Complete a combo of 20 moves (any play mode)