Just bought the DLC yesterday and got two of the five achievements, however they do not add to my gamer score. They flashed up on the screen like any other achievement would and the achievement page shows them as completed. Odd thing is that the page never added the DLC achievements to the total for the game. If I go to xbox.com and view my account the DLC achievements do not even show up. I have tried to uninstall/re-install the DLC and recover my gamer tag. Any ideas?