[2021] Loaded save from PS5 on Xbox Series X and achievements have not unlocked

Hi guys,

I finished the main story on PS5 and I'm now continuing on Series X. Unfortunatly only the progress syncs but not the trophy -> achievment auto pop-up part.
I read several posts on google and reddit that some people actually were able to do this? Is this true with the most recent patches to Valhalla?
I already unlocked a new achievement I never had on both platforms hoping this would trigger the rest but no luck.
Some say that starting new DLC would trigger this since its new on both platforms...

Thanks !