Battle.net

Win 3 1v1 Unranked or Ranked games in a row.

Complete the Wings of Liberty campaign.

Destroy 40 units with a single unit in an Unranked or Ranked game.

Kill 50 supply worth of units within 15 seconds in a Melee game.

Destroy 4 Command Centers, Hatcheries, or Nexuses in an Unranked or Ranked game.