A deadly game of hide and seek

Uncover the secret of Arkham City

Last man standing

Drop in on an old friend

There is only one way in

Find someone to play remote Batarang catch with

Complete story mode on Easy difficulty

KO all the henchmen celebrating your arrival at the party

Solve 25% of Riddler challenges

Venture into Killer Croc's lair and come out alive

Defeat two Titan Henchmen at once

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