I specify Steam because the Xbox Companion app shows a different, higher number of achivements unlocked, but Steam shows less.
Currently, my Xbox profile shows 37 achievements unlocked and Steam shows 35.
The two missing achievements are “I am the Captain Now” (Reach Rank of Captain in Tour of Duty) and “Back on Your Feet, Soldier” (Used Jack’s STIM ability to revive a DBNO friendly in Campaign). The former has been missing for days and the latter has been missing for weeks. This is literally the only game on Steam I know/have that has issues with unlocking achievements…not that it’s surprising at this point with the constant crashes and inability to find any custom Escape matches.