Encounter the same Orc 3 times in nemesis missions without killing him.

Meet an Enemy or a Follower who has cheated death.

Kill The Black Hand.

Kill all 5 Warchiefs before any uruk take their place.

Complete all Survivalist Challenges.

Save Lithariel's life.

Kill the Great White Graug.

Complete all Acharn Legend Missions.

Complete all Outcast Rescue Missions.

Activate all Forge Towers.

Start a Riot by commanding a Warchief to attack another Warchief.

Free 5 caragors from cages.

Use the Detonate ability to burn 50 uruks.