Another easy way to get this without boosting is on a map that includes a sword spawn.(Construct,The Pit) ; or as mentioned an actual game of swords. Just aim to stick the guy with the sword, don't worry about being skewered. Just rinse and repeat.
I personally got this on The Pit. I went to the area underneath the sword spawn grabbed the sticky grenades, grabbed the overshield then went up to the sword.
I got lucky because some guy kept going for the sword everytime. So I just stuck him, he skewered me, then we did it all again. Most people who go for the sword on this map camp at the sword waiting for someone to come past. Use this to your advantage and stick them just as they think they have you.