@mostman: It's ordered by last-played based on you viewing your own profile, but alphabetically when someone else views your profile. We actually have a solution for this coming when we start doing the regular updates again.
All XBOX achievements that at least one Giant Bomb member has unlocked should now show the correct number of points. All of these points have been rolled up to your overall XBOX gamer score. They're currently being rolled up to each of the individual games you've played (the totals that decide what grade you receive for each game). These should be done shortly (maybe an hour or so from now). Once this is done, your scores should be pretty close to what you see on XBOX.com.
Please keep in mind that we haven't turned back on the auto-update feature for XBOX accounts yet. We're still working our way through the rest of the user's that haven't been synced since the xbox.com redesign. This means that we might be missing a few achievements that you've earned over the past week. Once all accounts are re-synced, we'll turn on auto-updating again to catch everyone back up.