Unlocking achievements on a game I've never played?

Have you tried to unlock an achievement on another game.

Your game history seems a bit odd,i've never seen so many games played without unlocking an achievement unless the gamerscore has been reset

I've heard of achievements not unlocking on the Xbox One right away, but a person's gamerscore would never decrease. From the OP's profile, they've only played 2 games total, and only unlocked achievements in NBA 2K15.

I've had achievements pop up months after i'd unlocked them.

Personally I think not playing your new games just because of a glitchy achievement is a bit silly but it's entirely up to you.

Maybe it's because I was gaming long before achievements were a thing.

I wouldn't worry,it will unlock eventually.You other games will be fine.

The achievements are unlocked, it’s just not showing the proper gamerscore for the unlocked achievements on much profile or the game itself. If you go to my achievement it will show Wolfenstein 2 as having 360/1000 for 19 achievements but if you scroll
through the list you’ll see I have a lot more then that unlocked. I’ve had locked achievements never pop but never gamerscore drop and never return even after unlocking achievements after 72 hours. The only reason I havent played anything is I’m trying to
see if it will fix itself but it hasn’t yet.

I've had the same problem with black flag, it says that I never completed sequence 19 but I've completed the game months ago. I tried replaying the mission and it still didn't unlock. The samething happened in COD ghost with "tickets please" I've shot the
guy off the grappling hook multiple times and the achievement never unlocked. They say that achievements will unlock after a couple of days, but it's been months and they are still not unlocked.

I've had achievements take a few weeks to suddenly unlock in Life is Strange. I've had others that never unlocked in games like AC: Origins, Kona and Condemned.