Destroy 4 Command Centers, Hatcheries, or Nexuses in an Unranked or Ranked game.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Score the rank of Gold in the “Covert Ops” challenge mission.
Destroy 50 Protoss structures in “The Dig” mission on Hard difficulty.
Score the rank of Gold in the “Rush Defense” challenge mission.