Score the rank of Bronze in the “Tactical Command” challenge mission.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.
Destroy an enemy Command Center, Hatchery, or Nexus while it is under construction in an Unranked or Ranked game.
Score the rank of Silver in the “Covert Ops” challenge mission.
Score the rank of Gold in the “Rush Defense” challenge mission.