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As Fire mar bill suggested, skags are a good candidate for this achievement.
I'd recommend loading up play-through 1 and go to Fyrestone. Get on top of the shack where you get the Power Coupling from the broken vending machine (for the Fix'er Upper mission). From there you can easily weaken then stomp a low-level skag.
Thanks all for the advice. I ended loading up playthrough one and getting a weak enough weapon that I could weaken not demolish skags with one shot and managed to hop on his head. The scythid in playthrough 2 wouldn't weaken enough with the weaponry I
had it was dead or ovew 100 hp,