Complete 25 missions in the Wings of Liberty campaign on Brutal difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Using Auto-Turrets, destroy 20 worker units in an Unranked or Ranked game.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Score the rank of Gold in all the challenge missions.