Gears of War 4

Need advice, finished the campaign co op with my brother for the first time and none of the achievements for completing it popped (we did it co op and hardcore) i checked my in game stats and it shows the campaign completed, looked at my war journal and it says i completed all 24 chapters but when i look further it only lists 23 being finished co op on hardcore (it doesn't list any being completed otherwise) if anyone is familiar with the glitch lmk. I know the game's achievements are buggy

You hace to complete every checkpoint co op or solo I did prologue co op and the whole thing solo it missed giving me like 8 achievements (100k fabricator, the customized Lancer big Betty and a few others until I did the prologie again)