Complete 25 missions in the Wings of Liberty campaign on Brutal difficulty.
Complete all the Versus A.I. Elite achievements.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Survive 15 Infested Horde Attacks in the “Night 2 Die" mode of the “Left 2 Die” scenario.
Complete all the Unranked / Ranked Combat achievements.