Untouchables

Untouchables is an achievement for Left 4 Dead.

Summary
No Survivor takes any damage after contacting the rescue vehicle.


 * If a survivor is pinned by a Hunter or grabbed by a Smoker, if they are saved quickly, they will not receive any damage, and the achievement can still be obtained.


 * If a survivor takes falling damage, friendly fire, or fire damage, the achievement cannot be gotten.

Tips
Using the glitch ledge on the Rooftop Finale in the No Mercy campaign is a far easier way to get the achievement rather than using just skill and plain luck.

Quite a hard achievement, If you want to go for it just put it on easy and find a good spot and you should be able to do it