Letter Quest: Grimm's Journey Remastered

If you're lucky, this one will happen naturally in one of the two modes while going for other achievements. I personally had it happen 2-3 times. As mentioned in Precision Striking, there is an item that can be purchased which shows how much damage a word will do to an enemy. If their entire health bar is flashing, it means your word will defeat them, so you'll want to do as much damage without their bar flashing.

This is another achievement that's best not to focus on while playing and it will most likely come naturally while going for the others.