Achievements

Mass Effect has 49 achievements worth 1200 Gamerscore points (achievement values are listed in parentheses).

Mass Effect 2 has 59 achievements worth 1255 Gamerscore points.

Mass Effect Achievements
Achievements for Mass Effect require you to play through the game at least three times to get them all. Certain achievements give more rapid experience gain, weapon damage, or unlock bonus talents that can apply to any subsequent careers.

Difficulty
You do not need to start a new career to receive these achievements; simply set the difficulty before you finish Eden Prime (so any time before activating the beacon) and do not adjust it subsequently.

Squadmates
These are tied to the Completionist achievement; you must complete a specific number of assignments with the desired squadmate. Each squadmate requires a different number of completed assignments to earn his or her achievement. NOTE: if you have downloadable content active, completing its assignments will count as a part of the amount required. (Xbox 360)