When power went out in my internet router room and i was launching my survival world when i looked at the advancments i only had a few of them unlocked.
It didnt even show all that I "didn't" or could unlock. It is really weird and I worked a long time on the advancments...
Actually, it's all good.
Apparently when I noticed that it said play offline I must've switched my accounts. And when I came back with my main account it was all good.
So to anyone who has this problem try switching accounts if you have a 2nd one. Hope it helps!