Splatter

This is a standard achievement in the game.

Description
Killed downed enemy with rock

Guide
To complete this achievement, you must knock down a live cannibal and kill her/him using an equipped rock (not the smaller throwing rock) while he/she is on the ground.

Steps

 * 1) Hotkey a heavier weapon, like the modern axe or club (recommended however not required)
 * 2) Hotkey a rock to a different item slot
 * 3) When fighting a cannibal, use a heavy attack (long left click) with your heavy weapon to knock them down (this may take a few tries and works better on smaller enemies)
 * 4) Once they are on the ground, pull out your rock and bash their head with a downward strike (this also may take a few tries)

Tips

 * You can hotkey an item by combining it with your backpack on the crafting surface and then right-clicking on an item slot
 * Cannibals fall down easier in normal mode, so it is easier to do this there.

Videos
Getting the Steam achievement 'Splatter'