These are 2 new abilities you get during 'The Foundation' DLC. Fracture allows you to break the 'crystals' with your service weapon, and Shape allows you to create the crystals at certain highlighted sections on walls/floors etc.
You'll be given the choice between the 2 fairly early on in the new DLC. It doesn't matter which you choose as you'll get the other a little further along. If you want to rush through this achievement I'd recommend Fracture as you get plenty opportunity to use it, and the crystals you smash grow back and can be broken again.
Should come naturally as you play through, no need to try go out of your way to get it.