Crown of the Magister Achievement not unlocking

1 week ago

I have played through the main campaign 2 times to completion and am attempting to 100% the achievements list, however I am stuck because each time I reach the point of the game where I receive the crown, the achievement does not unlock.

This is my Steam page.

This is a screenshot from my Exophase account to track achievement progress for hidden achievements.

I am about to start a 3rd playthrough and would appreciate if this could either be fixed or if I could have the achievement retroactively added to my account.