ME2: Gain the loyalty of the biotic Convict

ME2: Gain the loyalty of the Assassin

ME2: Gain the loyalty of the Professor

ME2: Gain the loyalty of the quarian

ME2: Fully upgrade a weapon

ME2: Complete the investigation of a derelict alien vessel

ME2: Thresher Maw defeated

ME2: Successfully recruit the quarian

ME2: Evolve any power

ME2: Defend a human colony from attack

ME2: Complete 5 missions discovered by scanning unexplored worlds

ME2: Successfully recruit the Professor

ME2: Complete a mission discovered by scanning an unexplored world