ME2: Successfully recruit the Professor

ME2: Perform 30 headshot kills with any weapon on humanoid targets

ME2: Save your crew from an overwhelming attack

Get your shell back.

Try on every shell in the game.

Defeated Praya Dubia.

Defeated Camtscha.

Completed the Way of the Predator.

Defeated Inkerton.

Defeated Roland.

Completed the Way of the True Crab.

Defeated Pagurus.

Defeated the Ceviche Sisters.