Not getting achievements on Xbox and it's saying I have completed it in the game?

I find myself to be an Achievement Hunter. In my opinion, though progress in game may be 100%, the game ins't actually COMPLETED unless all achievements have been... well achieved. I wouldn't say I try to get as much Gamerscore as possible, I just feel like
achievements are part of game completion.

DisclosedBarrel,

is any of your achievements are stuck in the done unlocking stage?

you're not alone, many xbox live users have faced this problem. I say keep playing these games that have achievements stuck in unlocking stage. before you know it, you will get the notification saying you got the achievement.

I do suggest on doing the achievement again. if its for completing the campaign then do it again.

Have a great one

I'm having a similar problem too with my 360. Managed to finally completed Dark Souls to 100% for it to then say it's 92% complete and 39/41 achievement got even though my Xbox and this site registers I have actually gotten all the achievements. Tried getting
a new achievement on a different game to see if that would fix the problem, it didn't work so I am now missing that achievement on Darksiders 2 as well.

Microsoft uses the achievements as the criteria for completion, not the gamerscore. If you look at your games played on xbox.com, there will be a completion bar for gamerscore, a completion bar for achievements (i.e 45/50) and a completion percentage. The
completion percentage is tied directly to the achievement completion bar.

For example, on Superman the Video game, I have 1000/1000, but I did not unlock the achievement for using a cheat code (it is a 0GS achievement). So, it says I have 17/18 achievements and only 94% completion.

Just because of this thread I had to go and buy a game that I knew for certain that I could get all achievements. So I can officially say that I have completed 1 game for all achievements.