This achievement may come naturally to some, but I had a real pain there are two areas that make this too easy.

After the mission "Young wine", the last on Act I, you'll be in a cave with Lydia and 2 enemies will enter.

Now this method, of course, is for the players before this mission.
*if you have passed this mission you cannot replay*


Now for the players who have gone passed this mission at the end of act one, I did find a method it has 5 enemies and there is a ledge nearby This is on the third map.



With the second method, make sure you do stock up on a few healing items and if they do happen to kill you load last check point and return they will still be there.



Also, a little bonus on the first method if you have the time and
persistence, you can keep restarting and max out all skill trees before act two lol.


Hopefully this helps a few of you Happy Hunting.