Evolve any power

Thresher Maw defeated

Help the Justicar resolve her mission

Gain the loyalty of the Assassin

Successfully recruit the Assassin

Complete the investigation of a derelict alien vessel

Gain the loyalty of the Cerberus Officer

Successfully shut down the rogue VI in Project Overlord

Gain the loyalty of the Cerberus Operative

Defend a human colony from attack

Complete a mission discovered by scanning an unexplored world

Perform 30 headshot kills with any weapon on humanoid targets