The South Park Pinball Add-on for Pinball FX2 has 4 achievements.
Start the Windy Bumpers on the South Park: Super Sweet Pinball.
Start the Mr. Hankey Multiball on the South Park: Super Sweet Pinball.
Get one outfit in Butters' Outfit mode in South Park: Butters' Very Own Pinball Game.
Start the Bikers Multiball in South Park: Butters' Very Own Pinball Game.