Complete the “Whispers of Doom” mission on Hard difficulty without Zeratul suffering life damage.
Complete the “Echoes of the Future” mission on Hard difficulty in less than 20 minutes.
Complete the Zeratul storyline in the Wings of Liberty campaign.
Don’t let the Odin drop below 30% of its total life in the “Engine of Destruction” mission on Hard difficulty.
Complete all mission objectives in the “Ghost of a Chance” mission.