UPDATE JUNE25: Wow, I never imagined this little experiment would have such a huge impact. The Kittygeddon was indeed set up by me and named "achievement_all_v4" was released on my server under the name of "House of matsys_regressiontest" (later renamed "Grind for stuff") starting June19th and ran it once every day until I posted this video. In the future I might make some tutorials on Map-based particles.
Map was based off of the real achievement server: "achievement_all_v2" by "TheAwesome", thanks to my betatester groups and people who kept it a secret: Partyvan, Hakata, Tomo Takino. Congratulations to Facepunch who figured out the map within a few short hours & telling me to contact Robin, and thanks Robin Walker for a community item. Finally thank you Valve for your games, PCgamer, Kotaku and all the increasing articles and blog coverage.