Build a Factory during the first 270 seconds of a Melee game.
Kill the Marauder Kill Team in “The Great Train Robbery” mission on Normal difficulty.
Complete the “Whispers of Doom” mission on Normal difficulty with 3 or more Stalkers.
Score the rank of Gold in the “Tactical Command” challenge mission.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.