Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Perfect! (30 points): Complete a level with 100% accuracy.
Collector. (50 points): Unlock all extras.
Silver Record. (20 points): Aquire all badges on 2 levels.
Gold Record. (40 points): Aquire all badges on 4 levels.
Platinum Record. (60 points): Aquire all badges on all levels.
Double Platinum! (80 points): Aquire all badges on Hard difficulty.
Multi Platinum! (100 points): Aquire all badges on Thrasher difficulty.
Trailer Trashed. (20 points): Defeat the Trailersaurus Boss.
Mythbusted. (20 points): Defeat the Crocodile Boss.
Crazy Train. (20 points): Defeat the Rat Boss.
Unidentified Rocking Object. (20 points): Defeat the UFO Boss.
Rocked the Doodlebug. (20 points): Defeat the Ant Lion.
Black Hole Strum. (20 points): Destroy the Transport Boss.
Heavy Metal. (20 points): Defeat the Spider Boss.
Fender Bender. (30 points): Complete 10 challenges.
Finger Pickin Good. (60 points): Complete 20 challenges.
In the Zone. (50 points): Obtain a score multiplier of 100.
Rock to the Rescue! (50 points): Finish the game and get the good ending.
Social Destruction. (50 points): Finish the game and get the evil ending.
Groovy! (50 points): Fully upgrade your shield or blast attack.
Rock Will Protect Me! (30 points): Complete any level taking no damage.
Gettin the Band Back Together! (20 points): Play a co-op game.
I Need a Burger! (20 points): Use shield with less than 25% health.
It's Alive! (50 points): Find all the Rob Zombie pieces.
Undead Astro Creep. (50 points): Defeat Rob Zombie.
Encore! (20 points): Score 1,000,000 in a bonus level.