Very easy to obtain in the first chapter, it will be the first achievement to pop up for some people, it was for me. Just shoot the body parts off of any creature you see. Once they are dead, make sure to go and stomp off the remaining limbs. I think that stomping on dead human bodies counts towards this too, but don't take my word for it. I just stomp on anything with a head, arms or legs. Just in case, and then it will make things easier and quicker.
TIP: Using stasis on enemies makes it a whole lot easier to shoot of the limbs because it slows them down massively.