Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Prevent the Protoss from capping a Tal’darim Altar in the “Welcome to the Jungle” mission on Hard difficulty.
Complete 25 missions in the Wings of Liberty campaign on Hard difficulty.
Complete the “Media Blitz” mission on Hard difficulty in less than 20 minutes.
Complete all the Mar Sara mission achievements.