Here is the full list of all 20 South Park: Tenorman's Revenge achievements worth 200 gamerscore.
Defeated Robo-Scott Tenorman 2.0!
Glass half full
Used all weapons in the game once
Barged through 10 walls
Defeated Robot Tenorman 1.0!
Super Power Sampler
Infiltrated 10 Ginger Robot defenses
Defeated 100 Ginger Minions
Performed 20 high jumps with Kenny.
Completed the first level
Joined and successfully completed a level in co-op mode
Hosted a level in Multiplayer (online or local)
Let's throw the ball around with Stan!
Collect all Time Cores in any level
Collect all the megamen in the game.
Earn a Gold Medal on all levels with any character
Find all secret areas in the game
Complete the game without dying once
Complete every level in any mode with each of the 4 characters
Complete the game in MP mode (online or local)