Aquiring seperate achievements on Xbox One and PC in same profile.

You would have to play the game on each platform. They're basically seen as separate games even though they are the same game.

Just wondered if the pc versions of games in the windows store that are also available on Xbox, contain seperate achievements? Not play anywhere titles, just regular ones, as I'm playing Torment:Tides of Numenera on PC (on gamepass) which states
in the description that it has achievements and I have also previously played it a little bit on Xbox, but I'm not getting any achievements from the PC version? Is it because I already unlocked the same ones on Xbox?

Yes they have separate achievements

Forza Horizon 4 on Steam is not the same as the PC/Xbox version. It is a seperate game with seperate steam achievements, so you will have to start again on the Steam version.

Steam'deki Forza Horizon 4, PC/Xbox sürümüyle aynı değil. Ayrı steam başarımlarına sahip ayrı bir oyundur, bu yüzden Steam sürümünde tekrar başlamanız gerekecektir.

sometimes achievements do not have a date on them,this doesn`t mean they are modding.

if every one doesn`t have a date or they all have the same date then they probably are.

it is possible to be signed in and not be connected to xbox live,this is when the achievements with no date on usually happen,they just say aquired on them

You could unlock an achievement twice by playing the same game on two seperate offline consoles.You would first need to have your profile remembered on both consoles. Play the game on one console then move to the otherwithout transferring your profile .But
once you went online you only get the gamerscore for 1 game not 2.