Ok so a while back I damaged my hard drive and had to format it, erasing all my save game data. I assumed all my achievement progress, for achievements i didn't yet have, would start all over (for example: drive 1000 miles in career.) I played Feeding Frenzy for the first time since it happened and after a level or two I got an accumulative achievement (Eat 1000 starfish bubbles). Same thing happened when I played Luxor 2 (My points were saved even though I had no save game data) So my question is do cumulative achievements save to your gamertag or is it all in your hard drive? Could I drive 500 miles in career and get the 1000 mile achievement, when i had 500 before i formatted my hard drive?