Score the rank of Gold in all the challenge missions.
Destroy an enemy Command Center, Hatchery, or Nexus while it is under construction in an Unranked or Ranked game.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.
Use Blink to save a Stalker in a Melee game.
Kill 50 supply worth of units within 15 seconds in a Melee game.