Successfully recruit the Krogan

Complete any research project in the Normandy's laboratory

Successfully recruit Archangel

Make 20 enemies scream as they fall or are set on fire

Return to active duty

Save your crew from an overwhelming attack

Complete playthrough with shield damage greater than health damage

Complete Virmire

Use Charm or Intimidate to resolve an impossible situation

Complete Noveria

Complete the majority of the game with the Alliance sentinel squad member

Register 250 synthetic enemy kills