Play enough qualifying games to get placed in a Matchmaking Ranked League.
Kill the Marauder Kill Team in “The Great Train Robbery” mission on Normal difficulty.
Complete the Tosh storyline in the Wings of Liberty campaign.
Complete all mission objectives in the “Breakout” mission.
Destroy an enemy Barracks, Factory, and Starport in the “Media Blitz” mission during the sneak attack on Normal difficulty.