Battle.net

Destroy 20 units with a single High Templar in a Melee game.

Warp in 100 units with Warp Gates in an Unranked or Ranked game.

Complete all 29 Wings of Liberty campaign missions on Brutal difficulty.

Use Blink to save a Stalker in a Melee game.

Score the rank of Gold in the “Psionic Assault” challenge mission.