Kill 750 additional Zerg units in the “In Utter Darkness” mission on Normal difficulty.
Load a Dropship with a unit that is under attack in an Unranked or Ranked game.
Kill 15 enemy units with a single Nuke in an Unranked or Ranked game.
Score the rank of Gold in the “Tactical Command” challenge mission.
Complete all mission objectives in “The Evacuation” mission.