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

Defeat Bane

Save all the doctors in medical

Solve 5% of riddler challenges

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

Survive the onslaught from the deformed Joker henchman

Take down Zsasz in the Patient Pacification Chamber

You achieved maximum P.L.A.V. mood

You successfully completed 10 action hijacks

You captured all outposts for a single faction

You've experienced co-op

You completed one of Fiona's challenges