Defeat Helm Hammerhand.

Send a Follower to kill another Follower in a pit fight.

Open one of the Ithildin Doors.

Equip 3 Siege Upgrades on an Assault Team.

Destroy a Monument.

Complete all Brûz quests.

Recruit a Follower of every Advanced Class.

Turn all of a Warchief's bodyguards (minimum 2) into spies, then confront him.

Purify all the Haedir.

Use planks and sticks to make a pickaxe.

Open your inventory.

Rescue a Follower who's been captured.

Send a Follower to support another Follower in a Nemesis Mission.