Complete Mass Effect 2 twice, or complete it once with a character imported from Mass Effect 1

Visit 100% of the planets in an unexplored cluster

Survive 1 wave in a Special Ops Survival game.

Obtain geth technology

Don't look down

Fight for survival

Help the Justicar resolve her mission

Thresher Maw defeated

Gain the loyalty of the Assassin

Hit 20 different targets with multiple biotic powers to combine the effects

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

Gain the loyalty of the Professor