Complete the following achievements to unlock Xbox Live Gamerscore points.

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