Achievement not unlocking on XBOX but appeared unlocked in-game

Sorry about that, Ben. If the achievement appears under “Locked Achievements,” either the achievement was not successfully unlocked, or the console hasn’t synchronized with the Xbox network. If it hasn't appeared after 72 hours, try unlocking the achievement again or contact the game support for further troubleshooting.

Some games managed to do what was asked in the conquiustas and did not unlock, an example was in Gears 5, the achievement unlocked more than a month later. See if the achievement unlocked in the list happens with the fact that it does not appear on the
screen but appears in the game list.

Thank you for the update. Kindly check your progress online by following the steps below:

1. Sign in at Xbox.com.

2. Select your profile icon in the upper-right corner, and then select Xbox profile > Achievements.

3. Select the title of the achievement that you're trying to unlock.

4. If the achievement appears under Achievements, it's already unlocked.

If the achievement appears under “Locked Achievements,” either the achievement was not successfully unlocked, or the console hasn’t synchronised with the Xbox network. Allow up to 72 hours for this synchronisation to take place. If it hasn't appeared after 72 hours, try unlocking the achievement again.

problem with unlocked achievements do not appear in the gamer score BATMAN AC GOTY we last 6 achievements (100 % completion ) appear as unlocked but the percentage of the game is 88 % , any ideas?and fix

To fill in some "blanks". Actually, every Achievement Unlocked has a few methods of the order it appears. If you Unlock an Achievement and view it from your own Profile it will simply show in the order the Achievements were Unlocked.

If you Compare Games with someone else (Friend or not doesn't matter), it will show both the combination of your Achievements and their Achievements but in the order they Unlocked the Achievement/s.

If the other Player has Achievements Unlocked that you do not, it will show in the order they Unlocked the Achievement/s with yours showing Locked directly across. If you have Achievement/s Unlocked that they do not it will be at the bottom of the Compare Games
in order of which the Achievement/s were Unlocked from your Profile.