Gears of War 3 Achievement problem?

Okay, so I just recently finished the Campaign with my brother. We both played from the start and got all the achievements for each Act, the only difference is that he got the completion achievement and I didn't, what's up with this? And also if I go to Select Chapter, everything is locked except for the first level of the final Act, but on his account everything is unlocked, what's happened?

 

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Last updated July 3, 2018 Views 4 Applies to:

for some reason when playing split screen, only the primary players stats and level data will save, i had it happen to me when playing horde and beast mode, i unlocked the achievements and when i logged back on solo the challenges wouldnt unlock and i couldnt get the skins for those achievements.