Originally Posted by JeanRob
We need someone to confirm it, BUT, it shouldn't be a problem. The bug seems to affect the DLC achievements, not the original 1K. So if you unlock the DLC ones, you should be able to unlock the multiplayer ones after.
i can confirm that a friend of mine was able to unlock ALL of the dlc achievements before getting any versus. he is now working on his versus and all are unlocking just fine so far. i would guess that this would be the case for anyone else too. here is a link to his xbox profile for confirmation...