Certain achievements not unlocking in Xbox network (XBOX)

Version: XBOX Series X (purchased, not Gamepass)
The Sultans Ascend expansion purchased aswell.

There are certain achievements, which I have successfully completed, but does not appear unlocked in the Xbox network. The game itself shows them as completed achievements. Far more than 72 hours have passed since unlocking them, so this is not a synchonization delay problem.

The affected achievements found so far:

  • Having a Blast (reported by others aswell)
  • Master of the Chinese
  • Master of the Ages (probably because of the previous achievement being bugged)
  • Master of the Ottomans

I haven’t finished the Byzantine and Japanese related achievements yet, so there may be other involeved aswell.

This is a very important problem for achievement hunters like myself, so please look into it.