Keep your team alive through the suicide mission

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

Reach Level 30 with one character

Successfully pursue a relationship with a teammate

Obtain geth technology

Survive all five waves in the battle for Object Rho ("Arrival" downloadable content)

Help the Justicar resolve her mission

Gain the loyalty of the Professor

Thresher Maw defeated

Gain the loyalty of the Cerberus Officer

Gain the loyalty of Archangel

Successfully recruit the Justicar

Fully upgrade a weapon