Steam Achievements not working?

[SirEnglishman 1]

Hi,

 

I noticed that the steam achievement for "Win 100 battles using vehicles of rank 7" hasn't been achieved on my account, even though I have over 400 battles on my Challenger 2 (2F) with a 48% Win Rate. I understand that it could have been a one off occurrence but other achievements that I should have also aren't unlocked, like "Wing Breaker", when I can clearly remember instances of getting the award in my Falcon, many more than 10 times. Same for "Street Brawler". Anyone else had this kind of thing?

 

Thanks