Destroy it all

Uncover the secret of Arkham City

Stop the unstoppable

Clear the airwaves

Rescue the first hostage from Riddler

Drop in on an old friend

There is only one way in

Save the medical volunteers

Save the damsel, but is she in distress?

Destroy 200 Terror Spider Droids.

Destroy the Gunship.

Kill an AT-MP by gripping its own missiles and throwing them back.

Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.