Find all 15 hidden secrets

Upgrade all four weapons

Upgrade the potency of the med kits

Find the flamethrower

Talk to Arthur when he's waiting in the car

Find the shotgun

Stealth Brand a Captain.

Challenge the Dark Lord in Mordor.

Have a dominated Caragath, Wretched Graug and Spitter Ghûl simultaneously.

Kill a Graug by dispatching your Ghûls on him.

Bait 10 Ghûl mounds.

Use a Wretched Graug's Projectile Vomit on an Uruk Captain or Warchief.