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.
Score the rank of Gold in the “Infestation” challenge mission.
Kill the Marauder Kill Team in “The Great Train Robbery” mission on Normal difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.