Defeat 5 Djinn With a Sniper Rifle

Kill 30 Enemies with the Tau Sniper

Kill 30 Enemies with the M9

Throw Back a Grenade and Defeat 2 Enemies at Once

Play in the Swimming Pool on the Cruise Ship

Defeat 20 Enemies While Swimming

Kill 100 Enemies with Headshots

Find 20 Treasures

Defeat 10 Enemies with Thrown-Back Grenades

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

Kill 30 Enemies with the G-MAL

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

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