Survive the nightmare of the Scarecrow's fear gas

Obtain 24 medals on the original Arkham City ranked maps (as Batman)

Rescue all the hostages from Riddler

Track down the serial killer

Reunite the separated couple

Collect all of Batman's gadgets and upgrades

Collect enough evidence to locate the gun for hire

Complete all augmented reality training exercises

Find someone to play remote Batarang catch with

Rescue the third hostage from Riddler

Absorb a dragon soul

Join the Companions

Select a Standing Stone blessing