Defeated Aegis in the main campaign (any mode & difficulty)
Defeated Reaper in the main campaign (any mode & difficulty)
Defeated Warlock in the main campaign (any mode & difficulty)
Defeated Mega in the main campaign (any mode & difficulty)
Defeated Locust in the main campaign (any mode & difficulty)
Defeated Omega Prime in the main campaign (any mode & difficulty)
Defeated Omega Prime in the main campaign on Brutal difficulty (any mode)
Defeated Omega Prime in the main campaign in Rogue mode (any difficulty)
Defeated Omega Prime in the main campaign in Rogue mode on Brutal difficulty