I literally got this challenge yesterday, with a 30 kill game.
I was the host, and I have quite bad internet, as shown here:
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so when the guys were getting owned, they left (this was a team tactical)
We got domination on highrise and we spawn trapped them literally from start to finish. 2 of them left so it made it MUCH easier to get this (50% chance to kill the top player)
My advice is, get a 4 man team together, and keep skipping maps until you get domination/demolition. It's gonna be dam hard getting this on Team Tac SnD.