Kill 50 Enemies by Melee-Attacking from Behind

Find 60 Treasures

Kill 50 Enemies with the M4

Find 50 Treasures

Kill 20 Enemies with the Wes - 44

Find the Strange Relic

Defeat 250 Enemies with Headshots

Finish the Game on Normal Without Changing the Difficulty

Find all Treasures and the Strange Relic

Find 100 Treasures

Kill 30 Enemies with the PAK-80

Activate a Tweak

Kill an Enemy While Playing as an Alternate Character Costume Other Than Drake