The first time you really get the chance for this is at the beginning of Chapter 2. After using/passing the Save Point, your locator will direct you to the Titan Height Apartments.
As you open the door, a Slasher will appear at the end of the hall and come running at you. Take him down quickly, before you move forward. When you do move forward, off to your right through some debris, you will see an Infector changing a dead body. Grab the spike in front of you on the floor with your Kinessis, aim, and launch it at him. It must go at least 17 meters, and it must stick.
The video below should help explain it more. I think they are on easy though, because it took more than one shot to kill the Slasher, and it took me several tries to hit the Infector just right. Their rig is the first rig you get in Chapter 1. Again, I think there were on easy just to figure out how to get the achievements - there was no upgrade. As I stated above, it took me several tries to hit it just right, and I was playing on normal. If you mess up, just reload your checkpoint.
If you have a problem getting it here, wait until you get the Javelin Gun, and you will get it. There were multiple times where I sent a baddie flying with it at long distances.
Credit to Achievement Hunter for the video upload.