Go Mecha Ball

This ability is randomly awarded after finishing a level. You get 3 cards to choose from, and if you're lucky, it will be the ground slam.

I found this super easy to get when targeting the little pink spiders. All I needed to do was press the to launch myself upwards, then press again to slam down on the ground. If you've got them inside your radius on impact, you will unlock the achievement. It's not as hard as I first thought. All you need is that card, and it shouldn't take many runs to grab it.