Clear the jet ski chase.

Purchase nanomachines for a teammate.

Clear "HIT AND RUN."

Hit the jackpot on a vending machine.

Upgrade a weapon.

Received all 4 support efficiency ribbons

Complete Mass Effect 2 twice, or complete it once with a character imported from Mass Effect 1

Use the Omega 4 Relay

Hack a geth collective

Kill enemies with 5 different heavy weapons during the game

Hit 20 different targets with multiple biotic powers to combine the effects

Thresher Maw defeated