Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the Tau Sniper

Kill 30 Enemies with the M9

Find 20 Treasures

Kill 20 Enemies with Gunfire While Hanging

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

Kill 100 Enemies with Headshots

Kill 30 Enemies with the G-MAL

Kill 20 Enemies with Headshots

Find 1 Treasure

Finish the Game on Normal Without Changing the Difficulty

Defeat 250 Enemies with Headshots

Kill 50 Enemies by Melee-Attacking from Behind