Need help with recovering achievements

If I understand this right you hacked your Gamerscore & were given a Gamerscore reset.

If that's the case then you cannot re earn those achievements on that account again,you would need to start another profile.

Well you don't need to change the privacy settings, but if the achievements shown on xbox.com are correct then recovering your account on your xbox should fix everything. If they don't show up on xbox.com, you probably still need to recover your account
but you'll need to get the achievements again.

Try recovering your profile. That usually fixes achievement inconsistancies. But, you might need to redo some of the achievements.

Hello there G3NTL3M3N,

Sometimes on certain games, you need to complete things like tutorials included in the beginning of the campaign to unlock "complete campaign" achievements. It also sometimes helps to redo the last level or redo the target of achievement you are trying to
accomplish.

I hope this helps.

P.s. - To "recover" your gamer tag, sign out of xbox live then press your guide button. You should see the option to recover your profile.

Achievements are glitched with this DLC, when the problem is fixed and the achievements show on xbox.com you will need to recover your profile and play through again