Resetting Achievements / Gamerscore

The only time achievements are removed are as part of a gamerscore reset. The enforcement team are in charge of gamerscore resets and only issue resets if they determine that the achievements were obtained by cheating/modding. They will not remove only certain
achievements, but they would remove all achievements on your account.

As it's all xbox 360 games it looks like you've had a Gamerscore reset for modding achievements.

When you receive a Gamerscore reset then you will not be able to re earn any reset achievements on that account.

I was always under the impression that when a gamerscore correction is done, it's not just "illegal" score that's removed, but the entirety of it, that is, it's reset to zero?

Typically they'll now only reset 360 achievements since it's not possible to mod One achievements. So you can receive a gamerscore reset and still have a gamerscore left. You'll also be able to see that you have the achievements for a game that has been
reset, but it will show you have 0 gamerscore for that game.

Sounds like you've had a Gamerscore reset for modded achievements.

When this happens you will not be able to re earn any reset achievements on that account again.

Xbox One achievements work differently & can't be modded which is why only your 360 Gamerscore was reset.

I'm afraid that there is no way to reset a legitimate gamerscore at all. Gamerscore resets are only given to people who illegitimately modify their gamerscore. When they get their gamerscore reset, however, there are a number
of other consequences:

1) All of the gamerscore will be reset to zero.

2) A person with a gamerscore reset will be permanently branded "Cheater" on your gamertag.

3) All lost gamerscore and achievement are gone forever, and irretrievable.