Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Feeling Like Floating ( 5 points )	Dissolve a turret.
Cupcake ( 10 points )	Beat 5 advanced chambers.
Fruitcake ( 25 points )	Beat 10 advanced chambers.
Go for the Gold ( 15 points )	Win a gold metal on a challenge map.
Is Anyone There? ( 20 points )	Complete the game without ever taking a bullet.
Like a Rat ( 20 points )	Trap yourself in a test chamber so that GLaDOS has to help you continue.
Out of the Blue ( 25 points )	Once you have control of both portals, only enter the orange portal.
Rat's Tale ( 15 points )	Find all the Rat Man dens.
Saw That One Coming ( 5 points )	Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it.
Tests Like Chicken ( 15 points )	Find the chicken's test results.
The Camera Adds 10 Pounds ( 10 points )	Knock a turret over with a security camera.
Vanilla Crazy Cake ( 35 points )	Beat all advanced chambers.