The joke's on who?

Clean up the Dry Docks

No crimefighter should be without this

Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.

Complete all augmented reality training exercises

Rescue all the hostages from Riddler

Rescue the fourth hostage from Riddler

Rescue the second hostage from Riddler

Retrieve your stolen goods

Stop all assaults in Arkham City

Collect enough evidence to locate the gun for hire

Reunite the separated couple

Destroy it all