For this achievement you have eliminate 10 enemies using hunting traps. I personally did this on predators rather than humans. All you have to do is craft the trap which you get from building Wogah's Hut.
Place the trap on the floor and wait for either a predator or an enemy to go over it. Note animals with lots of health like the Sabretooth Tiger will take 2 hits from the trap so keep that in mind. Animals like the cave lion and wolf only take 1 hit.
Hope this helped.