Kill 50 Chaos Space Marines.

Kill Warboss Grimskull once and for all.

Fire the Psychic Scourge.

Kill 500 enemies using Melee weapons.

Kill 25 Ork Nobs.

Kill 500 enemies using Ranged weapons.

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

Destroy the Orbital Gun.

Multi-kill -- 5 enemies with 1 Frag grenade.

Kill 100 enemies.

Attacked enemy soldiers by blowing up an oil drum or truck (single player only).

Perform as the vocalist