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

Hell Hath No Fury (5 points): Destroy 10 pieces of scenery.
What Did You Do, Ray? (5 points): Download and play against a Ghost from a Leaderboard entry.
To the Conservatory! (15 points): Find a secret exit.
You'll Believe a Ms. Can Fly (10 points): Complete Single Player level 3-14 without touching the ground.
Helped a Lady Across the Street (10 points): Complete Multiplayer level 2-14 without one of the players 'sploding.
Sore Thumbs, Inflated Ego (20 points): Complete all of the Single Player levels.
Score One for Team Awesome (20 points): Complete all of the Multiplayer levels.
Best of the Best (30 points): Complete all of the Single Player levels in Hardcore Mode.
The Golden Left Shoe Award (25 points): Collect all 47 pairs of shoes in Single Player mode.
The Golden Right Shoe Award (25 points): Collect all 50 pairs of shoes in Multiplayer mode.
Credit Card Is Maxed (20 points): Buy all of the unlockables.
Found Star Road (15 points): Find Star Road.