Purchase all skills in all categories.

Rope pull 5 enemies off edges.

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

Complete all conversations with the Endurance crew.

Collect 75% of all relics.

Kill FeeFee the crab.

Purchase all skills in one category.

Kill 40 enemies with the shotgun.

Kill 75 enemies with the rifle.

Shoot 10 enemies off zip lines.

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

Kill 35 enemies with the pistol.

Find 25% of GPS caches.