Carl1992,
Sorry to hear that, have you tried all the solutions in this thread
forums.xbox.com/.../1958241.aspx
And I quote;
"If you're on Xbox One:
Ensure you were connected to Xbox Live. If you weren't, try connecting to Xbox Live then attempt to unlock the achievement again.
If you were connected to Xbox Live and you completed the full requirements for the achievement, wait a full 72 hours, then check on Xbox.com or your Xbox One console and see if the achievement shows as unlocked.
If things still aren't looking right, give the following troubleshooting steps a shot:
Remove your account from your Xbox One console.
support.xbox.com/.../remove-profile-from-console
Power cycle your Xbox One console.
support.xbox.com/.../power-cycle-console
Download your account to your Xbox One console.
support.xbox.com/.../download-your-xbox-live-profile-to-another-xbox-one-console
Attempt to unlock the Achievement again.
If the achievement is showing as unlocked, but you're not seeing the Gamerscore from the achievement added to your total Gamerscore and the unlocked count for the game in question is incorrect: Head over to your profile on Xbox.com, view the game and achievement
in question on your profile, then wait a full 72 hours for things to process.
If these steps did not work, proceed to Phase 3."
"Phase 3: Take our SURVEY here
twtpoll.com/eij5wtjyqxxkiqa
If you've tried checking your progress on TrueAchievements.com to ensure that you're properly completing the achievement AND you've tried the troubleshooting steps listed above, let us know! Please be sure to fill out all of the requested information in
the survey or we will not be able to assist further. Once we've looked through things on our end, you'll receive an email response to the contact email address you have registered with us!"