Kill Warboss Grimskull once and for all.

Play each class in Multiplayer.

Multi-kill -- 2 enemies with 1 Stalker-Pattern bolter shot.

Kill 500 enemies using Ranged weapons.

Get 100 Headshots.

Retrieve the Power Source.

Kill 500 enemies using Melee weapons.

Killed a Helghast by shooting a Burster plant

Destroyed all the Helghast Tanks in the Senlin Beach section

Performed first Brutal Melee move

Destroy the Orbital Gun.

Kill 25 enemies with Ground Pound.