Well as I imagine you can tell by the title may accomplishment stats have reset. Now I've done a bit of research on this before posting but most of the stuff I found was about three weeks old or more but I was wondering if there has been any sort of fix to this as I have now played through the Single player campaign on insanity twice only to have missed a mission on the first play though and for the stats to reset reset on me just before the Cerberus base on the second.
Needless to say, this has stopped me from getting the Veteran and unwavering achievement, the former of the two is not so much of a big deal but the latter is something that I really done want to have to redo for a third time considering I've already played an additional play through just to get it.
TLDR; looking for possible ways to undo the accomplishment stat reset
Note: I'd also be interested in knowing if anyone knows why it happened in the first place.