Perform a 50 hit combo

Complete story mode on Normal difficulty

KO all the henchmen celebrating your arrival at the party

Complete a combo of 20 moves (any play mode)

Solve 70% of riddler challenges

Conquer the effects of the Scarecrow's fear gas

Get 100% kills on any floor on Don't Hurt Me or harder

Exit any floor at any difficulty

Complete Astral Academy

Capture and lock up Harley Quinn

Save Dr. Young from being killed by Victor Zsasz

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