Defeat 30 Enemies in a Row with Your Side Arm

Kill 10 Enemies in a Row, Alternating Hand-to-Hand Combat and Gunfire

Kill 10 Enemies with Grenades While Hanging

Kill 50 Enemies by Melee-Attacking from Behind

Find 100 Treasures

Kill 30 Enemies with the Tau Sniper

Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the T-Bolt Sniper

Kill 30 Enemies with the M9

Throw Back a Grenade and Defeat 2 Enemies at Once

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

Kill 30 Enemies with the Arm Micro