Complete the following achievements to unlock Xbox Live Gamerscore points.

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.
Rat's Tale (15 points) - Find all the Rat Man dens.
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.