How to get the "Overkill" achievement on Minecraft?

I'm having some problems to get the "Overkill" achievement.

The achievement's description says:

Deal eight hearts of damage in a single hit.

So to achieve this achievement I built a Diamond Sword and then I used the last enchantment at the enchantment list and it didn't worked.

What should I do to achieve this achievement?

NOTE: The enchantment was the one that used something like 9 of my levels.


Solution 1:

So the diamond sword was a good start.

Enchanting is the right way to go, you'll want a high level enchantment though, save up your 30 levels and spend them all at once (it doesn't take too long to get to 30).

Make sure you've got one of Smite, Bane of Arthropods or Sharpness. The first two are better, as they deal more damage, but you can still do it with Sharpness.

Once you've enchanted, find out what your sword can damage most. I.e. if it's got Bane of Arthropods, find a spider.

Next, maximise your damage by jumping to deal a critical hit. With all these factors you should easily deal 8 hearts of damage.

Remember that the amount of damage per hit varies, so you may need to whack a few mobs before you get the achievement.