Perform 30 vertical stealth takedowns

Listen to all optional conversations in game

Complete the game in explorer mode

Defeat 100 enemies in a row without dying in combat

Play in the ocean near the sunken ship

Find 50 treasures

Find a Journal Note

Stealth take-down 5 enemies

Finish the game with a clear time of under 5:00:00.

Kill 25 enemies with melee attacks.

Complete the game on Nightmare difficulty.

Use a secret explosive weapon to kill 10 enemies. (Agony Bolt effects negate results)

This cave echoes like crazy. Better put the gun away and keep quiet. (Ch. 8)