Missing Achievements please help

So i am missing achievements from cod black ops.on my xbox360 i got one for completing the campaign but not for anything else i did during the campaign. not even finishing the missions. I have contacted Activision and they were unable to help me.

I have looked at my achievements at xbox.com and does not show them. so i do know that they are truly missing and its not just my console

i completed the campaign on 8/9/2014.

I have cleared system cache

rerolled system update

deleted and re-downloaded my game and profile

tried replaying the campaign

also moving my profile to a different storage device

:)

 

Achievements unlocking but Gamerscore not updating

I am having the same problem as some members have been reporting regarding missing G. In the last 2 days, I'm missing 100G from achievements that have unlocked. Please help!

 

Contact Xbox

Forza motorsport 2 servers down for over two weeks. What is happening?

Also missing various achievements. Please help xboxnz

 

Were you online at the time you earned those achievements? Achievements earned while offline do not load onto your account.

Sometimes, given time, they may populate though.

 

yes i was conneced to the internet. and i know it can take time but i compleated the campaign on 8/9/2014

 

I was doing some research on the game's achievements and it seems that if you used any cheat codes in the campaign they can disable the achievements. If this is the case you should replay the levels to re-earn the achievements.

 

thanks for your research but i have not used any cheats or mods for the game.