So I've had Dawnguard since before it's release, I was actually in the beta for Dawnguard, I got all the achievments, and when I go and look at my achievment list it says I have all of them.
But when I'm just browsing through my games it says I have all the achievments in Skyrim except Dawnguard's.
I have all the achievments. ( Skyrim, Hearthfire, Dawnguard, Dragonborn )
But the only achievments it won't show are my achievments from Dawnguard. It also won't say the game is 100% complete under the ' Completed Games ' section.

Anyone know wth is going on?
I tried talking to Microsoft before, they told me it was something I'd have to take up with Betheseda...
I don't see why.

Actually, it says I have a couple of them, but the others you can't see. Even though I've played through Dawnguard on the same account countless times.
For example; I have the Vampire Mastered achievment, and the Defeat a Legendary Dragon one. But none of the story ones, or the Werewolf mastered one.
Which I know for a fact I should have all of them, because I've beaten the story, and play mainly as a werewolf.