Complete Act 2

Kill 15 enemies with a stealth kill

Complete any single player mission without using med kits, but taking damage

Kill all enemies in the beach houses without causing an alarm ("Leave No Man Behind")

Take 50 headshots in single player

Kill 20 enemies from a distance of 600m or greater

Take a successful shot from a distance of 1 km or greater

Liberate all outposts.

Hunt and skin a rare animal.

Liberate 3 outposts.

Kill Hoyt.

Use your wingsuit to reach the Southern island.