Left 4 Dead

If you want to get this legitimately simply listen to the video for tips.

If you can't do this normally then simply do split-screen and have one controller on each team. For the controller that isn't getting the achievement simply kill all the computer players then get killed by the infected. For the other controller actually play through or simply run about 50 feet from the saferoom and die.

Oh and if the achievement isn't unlocking, doing it offline should help

thanks to doormat4999 for the video

Call me simple minded but sometimes I cannot understand a solution. I tried getting it legit and it wouldnt pop, i tried with a second controller and still wouldnt. After reading LausDomini''s message in STZ513's solution I managed to get it.

So I wanted to repost the solution differently, more detailed, so credit goes to LauDomini for this.

Start the game and get to the main screen. Load your profile and connect a second controller. Press Start on the 2nd controller and choose Guest as the 2nd profile.

Now go -> Play Versus -> Play With Friends -> Create Lobby ->Versus Mode ->

Settings:

Campaign - Crash Course
Permissions - System Link Game

and click Create Lobby. Chapter 1 is Ok to start from.

Controller 1 who gets the achievement starts as Infected and the 2nd as Survivor.

As soon as the game starts take the survivors out of the safe point (helicopter) so that the infected, you, can spawn. What worked for me is, i took them at the far left corner of the building in the left where there are some dumpsters. Now you need to kill them all with your infected and the help of the local zombies. Every survivor picks a health pack so they will take some beating before going down. What I found really useful was the boomer. Standing on top of the building and vomitting on the survivors below you brings out a horde of zombies which take quite a chuck of health to them. Oh and dont forget friendly fire is ON so your 2nd controller can help you put them down faster.

As soon as they die, controller 1 will spawn as survivor and the 2nd as infected. Take your survivor and leg it. Run through the entire chapter to the ending safe point. Spawn your infected 2nd controller and leave him in a corner anywhere. It doesnt mind if the survivors are too far at all. Oh and remember any zombie kills with your 1st controller DO COUNT against the 54k kill cheevo.

Chapter 2 starts and you are survivor again. Same as before , leg it to the end and start the generator and get in the truck. Your 2nd controller as soon as you start the generator transforms to tank so it helps to bring him around so that you and your buddies have an easy Tank kill.

Now Chapter 2 starts again but you are Infected now and 2nd controller is Survivor. Same like the start take your survivor out of the safe house just outside, take the boomer and vomit on everybody with you friendly firing everybody.

The game finishes and the achievement popped for me when it was "loading" to return at the lobby.

This works as of 15/8/2011.

I hope I helped the people who were as confused as me with how to do this "offline".

An easy way to get Wipefest, Truck Stop and Smash Hit all in one go!
Local match, one controller per team. First round, both teams kill themselves (just stand on the fire until incap X 3, cpus will help you up)
Controller getting achievements should play through normally. make sure all 4 surivors, or close enough, get into the rescue vehicle.
The one not getting the achievement, playthrough up to the hoard like normal. die as the first tank. then, get yourself killed as a boomer or smoker. see what you will spawn as next. is it is a hunter, get yourself killed as that, and then the next infected also (back until the spawn should be what it was before the hunter. then, die as second tank.
when the vehicle opens, the cpus will run to it. before you are a tank, you should spawn as that hunter. go near the human player. THE HUMAN PLAYER SHOULD BE NEAR THE CAR AT THE BACK OF THE AREA! When you become the tank, the hunter should pounce the human (if you didn't do it in time before you became tank).
The survivors will all rush to save the human player. they will all stand around (after killing hunter) to help human player up, by at which time, you should be near enough to incap all three survivors (using the car). You should instantly get 'Wipefest' (and 'All 4 Dead' if you don't have it, assuming they helped up the human player). Shortly after, 'Truck Stop' should pop, when the scores show up. 'Smash Hit' tends not to pop until the match has ended.

Summary:
Local Match, 2 players.
die in 1st round
Achi controller finish round as humans
non achi controller finish round up to 2nd tank
stand near car at back, get incapped by hunter after vehicle is open
as tank, hit car at all 4 survivors, ding, 3 achievements!