Escape from Intensive Treatment to the island surface

Rescue the guards and henchman from the Joker toxin in Decontamination

Complete a combo of 5 moves (any play mode)

Collect more than $30,000 in a single player campaign.

Kill an enemy of every type in a single player campaign.

Finish the single player campaign on any difficulty.

Collect all the weapons in a single player campaign.

Purchase all the upgrades for one of your weapons in the single player campaign.

Kill 50 enemies with melee attacks in a single player campaign.

Kill 3 floating enemies.

Kill an enemy as a chicken in an online game

Finish the game on at least easy difficulty.