Rescue Jacob from the gulag

In multiplayer, defeat 150 enemies with the Heavy's Sentry Gun.

Stealth kill an enemy while they are having a conversation

Survive the avalanche

Translate a Monolith

Kill 40 enemies with the shotgun.

Kill 75 enemies with the rifle.

Kill 50 enemies with the bow.

Fully mod and completely upgrade any weapon.

Find 25% of GPS caches.

Collect 25% of all relics.

Collect 5000 pieces of salvage.