For this you will have to make the stalkers fall to the ground, either by stabbing them in the back or by throwing diversion items at them until they fall. (Note you will only have to do this once and can be done through multiple playthroughs)
All the stalker's you will need to do this to...
Andrea (Not miss-able and is very easy to do)
Ashman (Miss-able and is hard to do)
Elisa (not hard can easily be downed like Andrea)
Red Nun, after you encounter her in the supply closet and after you help Elisa escape. (Miss-able and somewhat hard)
Porcelain (Very hard and is miss-able)