Lose the enemy 10 times

Perform a Stealth Takedown from a mud-covered wall

Hunt and kill 10 enemies while Perception is active

Rescue Hakan from the cultists

Use every gun in the game

Complete a climb after finding the Overhang Climbing Gear

Commandeer 6 vehicles by jumping on them and kicking out the driver

Learn of 5 interesting locations from civilians

Enter the Temple of Life's inner chamber

Buy an item from a merchant

Purchase a Skill

Remove the dagger from the Temple of the Moon

Defeat an enemy with the last bullet in your handgun clip