You'll need a second controller to get this one. If you have a WIN10 PC and a 360 controller you can stream the game and hook up the 360 controllers to your WIN10 PC and use that for the second controller.
I went to the fountain stage (second stage). Kill everything but one archer. Put the second controller by the archer. If the archer is shooting the first controller, put it behind the second controller. The arrows will kill the second controller. Have the first controller stand by them and then mash
to revive them, which you should be able to do before the next arrow. Repeat this 15 times for the achievement. I do this with a second real profile not a guest, but I assume it would work with a guest as well.