Score the rank of Gold in the “Rush Defense” challenge mission.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.
Hold a Xel’Naga Tower for 5 consecutive minutes in an Unranked or Ranked game.
Use Blink to save a Stalker in a Melee game.
Cancel construction of a structure that is being destroyed by an opponent in a Melee game.