Sold 50 guns to a shop

Killed 15 enemies with the Soldier's action skill

Defeat 3 Majini at once by setting oil canisters on fire.

Solve 10% of riddler challenges

Escape from Intensive Treatment to the island surface

Rescue the guards and henchman from the Joker toxin in Decontamination

Complete a Co-Op mission with just 2 people.

Purchase every item in the upgrade menu.

Don't worry. We won't tell if you don't.

Complete the Enemy Tides Challenge.

Complete the game.

Reach the final fight.