Destroy 4 Command Centers, Hatcheries, or Nexuses in an Unranked or Ranked game.
Beat the Terra-tron on the Lost Viking arcade machine.
Score the rank of Gold in the “Rush Defense” challenge mission.
Destroy all Zerg structures in "The Devil’s Playground” mission on Normal difficulty.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.