CO-OP Legendary not registering!

Games Other Halo
1

So I have completed halo 4 on CO-OP legendary but I’ve not unlocked the achievement due to my halo stats resetting for a brief moment a few months back. Now in order for my xbox to register that I have finished the campaign on legendary all over again!

Is there anyway to undo this?

All of my data to prove I have done it is on Halo 4 Stats.

This was clearly not my fault, so how do I go about resolving this issue?!

2

I am not sure, but i’d be happy to run through the Campaign on LEgendary again

3

Did you make sure to start at the beginning on Legendary instead of another rally point?

4

It doesn’t matter where I started, the data had completely gone. It’s just really frustrating.