Win a 1 vs 4 Multiplayer Custom Game with no Allies against 4 Very Easy A.I. opponents.
Score the rank of Gold in the “Infestation” challenge mission.
Complete all 29 Wings of Liberty campaign missions on Hard difficulty.
Kill 5 Changelings in an Unranked or Ranked game.
Win a 1 vs 2 Multiplayer Custom Game with no Allies against 2 Medium A.I. opponents.