Complete the following achievements to unlock Xbox Live Gamerscore points.
Additionally there are twelve secret achievements.
In the mission Beat Up Clyde, if you choose to walk out of the room with Mr. Slave rather than trying to deactivate the snuke, then you will witness a special alternate ending.
Most Chinpokomon can be collected while progressing thgrough the storyline. However, the following Chinpokomon are only available in quests that cannot be returned to later. Find the following Chinpokomons before defeating the final Boss of those quests.
Fart on Stan, Kyle, Cartman, Kenny, Butters and Jimmy. It only counts if you fart on them when they are your selected partners, and not as characters in the overworld.
Go to the indicated location to find the corresponding person to befriend. Note: Some are missable and are only obtained during quests that cannot be returned to later.