Finish the Game on Easy Without Changing the Difficulty

Kill 30 Enemies with the Tau Sniper

Defeat 10 Enemies with Thrown-Back Grenades

Find 20 Treasures

Kill 30 Enemies with the Mk-NDI

Defeat 20 Enemies by Blind-Firing While in Cover (without aiming)

Kill 30 Enemies with the G-MAL

Kill 20 Enemies with Headshots

Defeat 20 Enemies with Hand-to-Hand Combat

Finish the Game on Normal Without Changing the Difficulty

Kill 50 Enemies by Melee-Attacking from Behind

Kill 100 Enemies with Headshots