Here is the full list of all 20 South Park: Tenorman's Revenge achievements worth 200 gamerscore.
Gold Medal champion
Completed the game without dying
Completed the game with all characters
Collected all megamen in the game
All secrets are revealed
Super Power Sampler
Completed the game in MP mode (online or local)
Defeated Robo-Scott Tenorman 2.0!
Glass half full
Collected all Time Cores in a level
Activated 5 switches with Stan's football throw
Infiltrated 10 Ginger Robot defenses
Barged through 10 walls
Used all weapons in the game once
Defeated Robot Tenorman 1.0!
Completed the first level
Joined and successfully completed a level in co-op mode
Hosted a level in Multiplayer (online or local)
Defeated 100 Ginger Minions
Performed 20 high jumps with Kenny.