Visit a store in the single-player campaign.

Kill a brute while it's charging you.

Modify a weapon.

Return to active duty.

Gain the loyalty of the Assassin

Beat a Friend's Skill Game Score

Successfully recruit the Quarian

Gain the loyalty of the biotic Convict

Gain the loyalty of the Professor

Thresher Maw defeated

Complete the investigation of a derelict alien vessel

Retrieve mineral resources by scanning and probing a planet in the galaxy map