So I was going to try out the new update on ff15 when I got a system update I was like ok I'll download it real quick. So I download the update and even though it says it was just to stable the xbox one It glitched up my system. Sometimes when I go to the menu some of the stuff doesn't want to load correctly, Sometimes i'll be watching a scene from a game and it will just randomly slow down. Heck for some reason the achievement keeps acting like I have the windows version of 15. If anyone else has the xbox one and has the same issue please let me know. I have no idea how to fix this.

I don't have an XBox One myself, and thus haven't experienced this, but have you tried contacting Microsoft's support line?  They may provide some advice on what to do, or if it is still within the manufacturer's warranty they may even recommend that you send the console to them to take a look at.  It might be worth a try.  Good luck!