A tip for "Axeman's Jazz" Achievement

[Zingiberale]

This is an achievement which requires you to brain 10 elite zombies with the Esteemed Mortal weapon. To get the weapon initially, you need to go to the main school building in Rampart. Find the band room on the first floor. Somewhere in there is a code for a safe. I think the safe you need is in old town (not sure) but the house you need to find has an entire corner missing. The safe is in that house. Once you have the weapon itself, you need to brain the zombies with armor on. Note that it says to brain them, not decapitate. This is annoying to do with the blade part of the weapon, but there is actually a little spike on the bottom side of the weapon that is perfect for braining elites. Hope this helps some people get this annoying achievement!

[Testymagic]

I used your tip and I have to say, the little spike is very hard to control.
You can't grab the weapon the way you want to, the hand placement does not allow to hold the Esteemed Mortal upside down.

My tip/How I did it:

When you reach the "no herd" days and you're getting the elite zombies (any zombie with any type of face armor) you just pick a spot on a map near a skiff (so your back is always clear)
Use the Esteemed mortal to:
Kill the zombies with the hockey mask (top of the head is exposed and easy to hit)
Kill the zombies with the broken helmet (there is a open in the helmet you can try to hit)
You might fail and risk them biting you, just grab them and trow them back to try again.

Kill al the rest with normal weapons.
You can try the spike, but I only got 2 kills from it and like 50 times where it only stuck partially in their face and was unable to push it in fully.

Just do this until you get 10 elite kills (no decapitions, they dont count!)