Explore a lost city.

Complete one multiplayer match or two N7 missions.

Destroy an Atlas dropped from orbit.

Bring a veteran officer aboard.

Modify a weapon.

Chase down an assassin.

Return to active duty.

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

Incinerate the armor of 25 enemies

Successfully pursue a relationship with a teammate

Obtain geth technology

Gain the loyalty of the Professor