Achievement and gamerscore glitch

So principally I accomplished the sport tremendous fast as a result of their was a glitch within the sport and was capable of get all of the achievements in lower than 30 seconds. All of the animations confirmed for all of the achievements nevertheless it’s saying I don’t have all of them despite the fact that I do. How do I repair this? I even have 12,070 gamerscore however I’m presupposed to have 12k