Battle.net

Use Blink to save a Stalker in a Melee game.

Win a 1 vs 4 Multiplayer Custom Game with no Allies against 4 Harder A.I. opponents.

Destroy a fully loaded transport in an Unranked or Ranked game.

Destroy 40 units with a single unit in an Unranked or Ranked game.

Score the rank of Gold in all the challenge missions.