Hivebuster achievements not unlocking on steam

So I played the Hivebuster DLC with my friend - I got all the achievements on steam (even though he hosted the game) however, only the first achievement unlocked for him. Has this happened to anyone else? Any fixes…apart from solo replay?

I played through it this weekend and I haven’t unlocked any of the steam achievements, as well. Haven’t found any fixes yet, but it’s not limited to just them.