Achievement didn't unlock!

I completed the Leviathan raid and even got the quest for the Arms Dealer. However, the achievement "Belly Of The Beast" did not unlock or award the 100 gamer points that it was supposed to. How can I fix this?

:)

 

Achievement didn't unlock!

[INTRODUCTION]

Hi my name is Harvey Turner AKA Gamertag:

I was hoping someone may be able to help me.

[INCIDENT]

I was playing the new Call of Duty WWII on my Xbox One S, Me and a friend are both playing on 2 different console's and have been trying for the past couple of week's to complete a certain challenge to get an achievement, We have both spent countless hours
trying to beat the Hardcore Easter Egg on Call of Duty WWII Zombies on the map called: The Final Reich. We finally beat the boss and completed the challenge which was suppose to give us both an achievement called "Dark Reunion". Upon completion neither one
of us received the achievement "Dark Reunion" so as you could imagine me and my friend are both a bit confused as to why we havent receieved the achievement.

[PROOF]

If you goto my capture's i have a recording of Call of Duty WWII Zombies which show's i have all 6 perk's unlocked which can only be aquired after completing the "Hardcore Easter Egg" on the map "The Final Reich" on "Call of Duty WWII" "Zombies".

[OUTRO]

I hope somebody is able to help me as this as this was such a hard achievement to get and we have both put in a lot of hours trying to get, We are both feeling a little down about this and would both be extremely grateful if someone could help us.

P.S I wasn't too sure if I should post this under game or under console and account due to the achievements being under both catagory.

 

Achievement didn't unlock!

this sometimes happens on games, i have had achievements pop 3 months after i earned them lol. there can be a few hours delay on the odd achievements.

 

Hi!

Did you have the notification for completing the achievement? Is it just a issue of synchronizing the score or did you not see the achievement unlocked?

Try to solve the problem by following these
instructions.

 

I have checked my microsoft account both on the xbox and on my desktop to see and still the achievement did not unlock or even register that I did the event. However, I received the exotic shotgun quest as well as the banner for completing the raid.