Thank you for the submission
CHunter. We can see that the achievement finally unlocked for you yesterday, not sure if you had to do anything special or it just synced on its own. As you already have the achievement (with a little delay) and there have been couple of issues with xbox live recently, we will not flag the achievement as Buggy- at the moment, but we will investigate a bit more and in case we can confirm the issue, we will update the flags.