Crash Of The Titans

This can be unlocked the very first time you jack a Shellephant, you can make him respawn by doing the jack then unjack trick as with "Aiming To Please" & "Monster Whisperer" achievements just make sure not to break down the big wooden door or else the Shellephant won't respawn.

If you find this solution to be unhelpful, please tell me why in a comment and I will update it the next time I'm online.

Despite the achievement description saying "by any means" you actually have to jack the same way five times.

Ex. If you use the shellephant you're on to attack the other shellephant and you jack that shellephant right off of the back of the one you're currently on you have to do that five times.

Or alternatively if you use the one shot power up you find on the back of the truck to take him down and jack him, you will have to do that way 5 times.
The power up will respawn periodically.

It can't be a combination of the two.