Purchase all skills in all categories.

Complete all optional tombs.

Fully mod and completely upgrade any weapon.

Rope pull 5 enemies off edges.

Kill and loot 10 flying animals (crows and gulls).

Kill FeeFee the crab.

Kill 75 enemies with the rifle.

Loot 200 enemies.

Collect 5000 pieces of salvage.

Shoot 10 enemies off zip lines.

Force an enemy to drop dynamite that kills two people when exploding.

Perform 50 headshot kills in the single player campaign.

Perform 15 finishers.