Score the rank of Gold in the “Rush Defense” challenge mission.
Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Complete 5 missions in the Wings of Liberty campaign on Hard difficulty.
Destroy an enemy Command Center, Hatchery, or Nexus while it is under construction in an Unranked or Ranked game.
Complete the “Whispers of Doom” mission on Normal difficulty with 3 or more Stalkers.