Russneedshelp

Okay 49 people have read this post, I'm clearly not alone. Anyone have a fix suggestion? 15 times now I have beaten the final level / boss and no achievments.... I have all the other achievments in the game

I have beaten the final boss now 9 times as Reinhart, across all difficulties and the finish the game as Reinhart (Calculus of Victory) achievement will not pop. I have also finished the game once as Lucas (Guardian of Ehb), and once as Anjali (Fiery Judgment) and no achievement I have all the other end game achievements, anyone else having this issue, or have any suggestions?