Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Complete all mission objectives in the “Piercing the Shroud” mission.
Kill 15 enemy units with a single Nuke in an Unranked or Ranked game.
Kill 50 supply worth of units within 15 seconds in a Melee game.