Perform a perfect combo including all of Batman's combat moves (any play mode)

Rescue the fifth hostage from Riddler

Platinum

Defeat 75 enemies in a row without dying

Inspect almost every display case in the Cartagena Museum

Defeat 30 enemies in a row with your side arm

Defeat 30 enemies with the Mag 5

Defeat ten enemies with grenades by aiming while hanging

Throw back a grenade and defeat two enemies at once

Defeat four enemies with one explosion

20 times in a row, pick up ammo while rolling

Stand on the crocodile in the Secret Library