Rescue the ACE Chemical workers.

Rescue your friend.

Lock up your first Supervillain in GCPD.

Solve 55% of Riddler challenges

Complete story mode on Normal difficulty

Defeat the giant Titan Ivy plant

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

Venture into Killer Croc's lair and come out alive

Complete a combo of 20 moves (any play mode)

Capture and lock up Harley Quinn

Face your biggest fears and keep your sanity

Gain access to Arkham Mansion after it is locked down by the Joker