Score the rank of Gold in all the challenge missions.
Kill the Brutalisk in the “Piercing the Shroud” mission without losing a unit to the Brutalisk on Normal difficulty.
Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Destroy 50 Protoss structures in “The Dig” mission on Hard difficulty.
Prevent the Protoss from capping a Tal’darim Altar in the “Welcome to the Jungle” mission on Hard difficulty.