Gain the loyalty of the Professor

Thresher Maw defeated

Gain the loyalty of Archangel

Gain the loyalty of the Cerberus Operative

Successfully recruit the Assassin

Gain the loyalty of the Cerberus Officer

Successfully recruit the Krogan

Defend a human colony from attack

Complete any research project in the Normandy's laboratory

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

Perform 30 headshot kills with any weapon on humanoid targets

Get through the first Zero-G area

Survive the Train Sequence