This is the easiest way to get this and will take less than 3 minutes depending on how fast you rack up points.
I wanted to do this solo, obviously you can't so I was going to using 2 controllers. BUT there is a better way, do not do this in tranzit and ride all the way to the power station. Here's what you do;
1.) Join an xbox live match in green run, town, survival.
2.) Survive and rack up 2000 points.
3.) Buy the tombstone perk from the machine, the machine is outside on the street (from the bank doors run straight across the street over the lava, jump up onto the circular block of broken street rising from the ground and the machine is to your left.
4.) Cook a grenade and down yourself.
5.) When the prompt appears press x to not feed the zombies.
6.) The other players will finish the round.
7.) When the next round starts you will re-spawn, run to where you downed yourself and grab your tombstone, boom achievement complete.