Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Destroy all Dominion Structures in the “Rendezvous” mission before Naktul’s brood arrives on Hard difficulty.
Prevent the Protoss from capping a Tal’darim Altar in the “Welcome to the Jungle” mission on Hard difficulty.
Destroy all Dominion structures in the “Planetfall” mission before the 5th Bile Launcher lands on Hard difficulty.
Kill 750 additional Zerg units in the “In Utter Darkness” mission on Normal difficulty.