Return to active duty.

Reach Level 30 with one character

Survive suicide mission

Use the Omega 4 Relay

Gain the loyalty of the quarian

Shoot and kill 20 enemies while they're knocked back by a punch

Successfully recruit the Quarian

Kill enemies with 5 different heavy weapons during the game

Thresher Maw defeated

Gain the loyalty of Archangel

Gain the loyalty of the Professor

Warp the barriers of 25 enemies

Successfully recruit the Assassin