Stumble Guys

EDIT: it appears all of these game mode specific achievements have the chance to bug out permanently regardless of how many times you win it, this has happened to quite a lot of people so far myself included and seems to be for just 1 of the game mode achievements per person. i have found a POTENTIAL workaround that got my achievement to pop it may or may not work for you but its what i did and hope it helps someone as i believe this is going to be an ongoing issue

Steps:
1: Switch to a different xbox
2: Reinstall the game on there
3: boot up the game and CANCEL the cloud save sync when it pops up and hit 'STOP SYNCING' you will still have all your progress so dont worry if you still see everything there
4: boot up your bugged game mode in custom games against any amount of bots it doesnt matter and win it

then hopefully it should pop after that first match at least it did in my case

all level specific achievements are easily doable in custom games against bots or can be boosted with a friend if you really wanted but its not needed as most of them came up naturally playing but some of the maps dont seem to be in the rotation at all

on the main menu go to party in top right corner

then hit custom game

and there you can choose whatever maps you want to play on for the achievements and how many rounds you want, you can start some maps by yourself making it absolute cake but i just played with 31 bots but you can do whatever works for you