MISSABLE ACHIEVEMENT!
can only be done on DLC map location, not in normal campaign.
just to let anyone know that the Ghul Matrons only spawn in the Torvin missions so make sure you pick this up either in Matrons mission or the last one, if you still haven't got it before you kill the last few, quit the mission and restart.
GET THIS DURING MATRONS RISING JUST TO BE SAFE!
if you have maxed out your character in main game then you should have fire arrows unlocked and can use these with RB after getting hit score up to 5.
if not you will have to blow up a camp fire, the green circle furthest north in ruins has camp fire .kill the Orcs first.
if you do fail to get it in the campaign missions, I'm afraid they don't spawn anywhere, regardless of day/night (spent hours looking) and will have to start a new save for this DLC and do it again...
BUT THIS ONLY TAKES 10 MINUTES.. go to save slots. Select new save slot. Play DLC do 1st mission then go to far left off map.. Select Matron level.. Ta da.
have been on various sites seeing if anyone has found a spawn location.. but nothing (unless they patch it in)