There is a guide to beat with perfect score in all those levels 

During the Portal 2 "Potato Fool's Day ARG", there was a special level added to the main menu. After the ARG ended, there was no way of accessing the level. Since the level is still in the game files however, it is still possible to play it. 

Traducción al español de AaAaAA!!! - A Reckless Disregard for Gravity 

Suppose it takes you 4 seconds to make a jump, suicide into a roof and respawn. This will require 4.5 hours of mindlessly jumping to earn this achievement. Here is a simple way to automate this, leave your computer alone for 4 hours, and come back with the...