Can use SAM picker and get all the achiv's you want.
That'll trigger Steam Achievements but those won't trigger Xbox Achievements. At least, Not in the testing that I've done so far.
I used to be able to unlock both Xbox and steam achievements with the unlocker by playing Steam but I haven't been able to do so recently (Within the last few days at least).
I'll try to see if they work on MCC via windows store but in my preliminary testing they did not.