Complete the “Whispers of Doom” mission on Hard difficulty without Zeratul suffering life damage.
Complete 15 missions in the Wings of Liberty campaign on Hard difficulty.
Complete “The Great Train Robbery” mission without letting a Train pass by on Hard difficulty.
Kill all Protoss in the “A Sinister Turn” mission on Normal difficulty.
Destroy 50 Protoss structures in “The Dig” mission on Hard difficulty.