Complete 'The Paths of the Dead'.

Stop all assaults in Arkham City

Reveal the mystery watcher

Collect enough evidence to locate the gun for hire

Rescue the second hostage from Riddler

All the world is a stage

Steal the score of a lifetime

Complete 'Cirith Ungol'.

Complete 'Osgiliath'.

Finish one of Gimli's opponents as Legolas in 'Helm's Deep'.

Complete 'Track Hobbits'.

Complete 'Taming Gollum'.

Complete 'Amon Hen'.