ME2: Complete a mission discovered by scanning an unexplored world

ME2: Complete any research project in the Normandy's laboratory

ME2: Unlock 15 new Mass Effect 2 codex entries

ME2: Save your crew from an overwhelming attack

Complete the game and collect all trophies.

Defeat the Nanny.

Collect all of the lost storybook pages.

Go home and knock.

Help Bernie find his way over Talkie Walkie.

Solve the puzzle in Fivetropolis.

Get a pep talk from Death.

Meet the Witch of the Valley.