Kill enemies with 5 different heavy weapons during the game

Gain the loyalty of the mercenary ("Cerberus Pack" downloadable content)

Complete 5 missions discovered by scanning unexplored worlds

Defend a human colony from attack

Gain the loyalty of the thief

Successfully recruit the Krogan

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

Complete any research project in the Normandy's laboratory

Perform 30 headshot kills with any weapon on humanoid targets

Make 20 enemies scream as they fall or are set on fire

Return to active duty

Save your crew from an overwhelming attack