Destroy an enemy Command Center, Hatchery, or Nexus while it is under construction in an Unranked or Ranked game.
Destroy all Zerg structures in "The Devil’s Playground” mission on Normal difficulty.
Complete all 29 Wings of Liberty campaign missions on Hard difficulty.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.