In this video guide I will show you how to get 50 kills with the slam ability. You will need to first head to the Earthscar Ark located in the Torn Plains region. It will be at the top of the area where there are mountains. Once you have the ability simply upgrade it all the way and get all the perks if you can. There aren't a lot for this ability so hopefully you can max it out to make the achievement easier. Once that is done start by using it on the enemies outside of the ark by holding the LB button and pressing the A button. Also higher jumps does some extra damage as well. So I you want you can jump off obstacles and do more damage. Just go around and find areas near the ark and use the slam on them all until it pops. Once the 50th kill counts the achievement will pop.