SMITE

This achievement is for hitting a player with six of Ah Puch's zombies in one Corpse Explosion. To explain in more detail, your first and third abilities summon corpses, which are placed on the ground. Your second ability, Corpse Explosion (it'll depend what controls you use, but it's on standard controls), explodes the corpses, dealing damage to anyone standing in the radius. The more corpses you explode, the more damage — that's why this is desirable.

The first ability ( on standard controls) is best for summoning corpses because it summons two corpses at a time. The third ability always only summons one corpse.

They don't have to be touching all six corpses, they just need to be somewhere in the blast radius (reference the video below if you're not quite sure what I mean).

So what you need to do is stack up your corpses in a centralized area. The problem is that enemies can destroy them with their basic attacks, so try to do it behind a pillar or within your own minion wave so it's harder for enemies to see and hit them. They also expire after a period of elapsed time, so make sure you're maintaining your pile and that you still have six. When someone walks into your nice little pile of dead bodies, explode them with Corpse Explosion (your second ability).

If you're more of a visual person, here is a clip of when I got the achievement:



If you have any questions, please let me know and I will do my best to help out or update the solution accordingly

Corpses aka Landmines- As Ah Puch blow up and hit an enemy with 6 corpses in one cast of Corpse Explosion.
Thankfully you dont have to kill a person with it. All you have to do is spam the undead surge and fleeting breath abilities near each other and try to bring someone close to you and use the corpse explosion to get the corpses to explode. One good way to doing this is having a friend be ares and let him use his ultimate on top of the corpses since it drags enemies right next to him. Once he does his ultimate just use the corpse explosion to detonate the corpses and achievement unlocked

Edit: According to Callum Rulez only one of the corpses has to hit the player out of the six.