Don’t let Stukov die in the “Phantoms of the Void” mission.
Complete the “Whispers of Doom” mission on Hard difficulty without Zeratul suffering life damage.
Use the A.R.E.S. to kill the Brutalisk in the “Piercing the Shroud” mission on Normal difficulty.
Destroy all Zerg structures in the “Unsealing the Past” mission on Normal difficulty.
Kill every enemy unit in the “Ghost of a Chance” mission on Hard difficulty.