a couple of issue

you can buy premium but it wont download.

i believe i did "cant win", but it dindt pop. anyway it isnt tracking it.

i know i did diamonds are forever, but it didnt pop.

Not sure about the premium sorry
With the achievements, when you say you DID them but they didn't pop what do you mean?

You have done them this month or recently and it hasn't unlocked?
Or have you done them on the Win8/WP versions and they haven't popped after the sync?

i completed the diamonds are forever one last night. no indication in app that the achievement was done, though i got the badge for doing it. if this was also a win 8.1 achievement, i also got it there. but if it was supposed sync over, it didnt.

as for cant win, i did 3 games/maps in a row on friday but no indication in game. im going to try again to see if it tracks the 1st in game.

fyi the diamonds are forever finally "popped" yesterday.

also, as of right now you dont get a notification on the pc that you have accomplished the achievement.

interesting, same for me with Diamond. just got the badge, but no achievement. tried popping into the stats page, badges page, achievements page, clicking the diamond on the progress bar, anything i could think of that might re-access the data from the servers. no luck. hopefully it will just pop up on its own, like it did for you.

update: i was able to get it to show as unlocked by downloading the game on my windows phone, however it didn't actually pop up. it synced to TA just fine. not sure if just using another windows 10 PC would have also worked. also noticed my tracker for Cupid (10,000 matches made) was not moving at all. i thought it was because i was playing daily challenges, but did some regular games and it stayed the same. playing on the phone gave me credit however.

QuickMythril, by download it on your phone was this a Win 8 or Win 10 phone? I might be in the same situation, but my badges won't even pop. They show 31/31 and 93/93 but nothing is happening.

WP10,  that will use the Microsoft Mahjong (Win 10) Achievements set. using WP8 will give you the Microsoft Mahjong (WP) Achievements.

That's what I was afraid of. I loaded the game up on another Win 10 device and 2 of the 3 achievements popped, but still stuck with one and no more devices to use.