Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Score the rank of Gold in the “Infestation” challenge mission.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Complete all 29 Wings of Liberty campaign missions on Brutal difficulty.