You have completed the first mission.

Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.

Last man standing

Answer the call for help

Drop in on an old friend

There is only one way in

Save the damsel, but is she in distress?

Complete story mode on Normal difficulty

KO all the henchmen celebrating your arrival at the party

Ride Titan henchman and knock down 10 thugs (any play mode)

Venture into Killer Croc's lair and come out alive

Defeat two Titan Henchmen at once

Capture and lock up Harley Quinn