Successfully Counter all of a Brute's Damage-Giving Attacks

Kill 30 Enemies with the RPG-7

Kill 30 Enemies with the Mag 5

Kill 30 Enemies with the Dragon Sniper

Kill 75 Enemies in a Row Without Dying

Kill 20 Enemies by Shooting from the Hip (without aiming)

Finish the Game on Crushing Without Changing the Difficulty

Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the T-Bolt Sniper

Kill 30 Enemies with the Tau Sniper

Kill 30 Enemies with the SAS-12

Kill 50 Enemies by Melee-Attacking from Behind