Defeat 250 Enemies with Headshots

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

Kill 20 Enemies with the Desert - 5

Find 30 Treasures

Kill 50 Enemies with the Micro-9mm

Kill 100 Enemies with Headshots

Find 20 Treasures

Kill 5 Enemies with Brutal Combo

Find 10 Treasures

Kill 5 Enemies in a Row with Headshots

Completed a Chanter's Board quest

Acquire all rare weapons.