Complete the “Echoes of the Future” mission with Zeratul killing 50 Zerg units on Normal difficulty.
Play enough qualifying games to get placed in a Matchmaking Ranked League.
Destroy all Protoss structures in the “Welcome to the Jungle” mission on Normal difficulty.
Use Blink to save a Stalker in a Melee game.
Hold a Xel’Naga Tower for 5 consecutive minutes in an Unranked or Ranked game.