ME2: Gain the loyalty of the Professor

ME2: Evolve any power

ME2: Gain the loyalty of Archangel

ME2: Successfully recruit the quarian

ME2: Complete the investigation of a derelict alien vessel

ME2: Gain the loyalty of the Cerberus Officer

ME2: Successfully recruit the Justicar

ME2: Complete a mission discovered by scanning an unexplored world

ME2: Gain the loyalty of the mercenary

ME2: Perform 30 headshot kills with any weapon on humanoid targets

ME2: Successfully recruit the biotic Convict

ME2: Complete any research project in the Normandy's laboratory