Boosting this is easy. 2 teams of 2 take turns winning by getting 1 versus kill per match, and then just leaving the controller for the rest of the time limit. NOTE: YOU CANNOT DIE, so make sure you read below on how you can idle without dying.
DO NOT PICK UP TIME. Each match defaults at 5 minutes, and that is TOO MUCH MORE THAN ENOUGH to get 1 kill against the opponent.
As long as the other team never kills you (and you never die), all you need is 1 kill against them, and then just wait the time out.
30 wins x 5 minutes a game = 150 minutes PER TEAM.
This is best done on Public Assembly, and once you get your points, just go to the top of the 3 story building and stand in the corner where the game prompts you to "jump down", but don't jump down. If you stand properly in that corner, no zombies will ever come to kill you, they will circle around the building and keep circling 3 stories below you. Both teammates can do this.
Use the same strategy for solo Survivors.
Out of all the DLC versus achievements, this one takes the longest, and I suggest should be done first, to have it done in a worst case scenario of boost groups disbanding.
If you're NOT boosting this achievement, just end up with more points by having more kills against the other team. Best suggestion is to learn rocket launcher spawns, and take out the boss characters and pick up the weapons they drop (like the S&W 500 handcannon, or the m3 shotgun) to use against the other team.