Set 100 enemies on fire with powers.

Visit a store in the single-player campaign.

Return to active duty.

Rescue Dr. Amanda Kenson without attracting hostile attention ("Arrival" downloadable content)

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

Save humanity throughout the galaxy from certain annihilation

Survive suicide mission

Successfully pursue a relationship with a teammate

Obtain geth technology

Gain the loyalty of the quarian

Gain the loyalty of the Assassin

Fully upgrade a weapon