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

Catch the Fever (5 points): Cure your need for fever with an Extreme Fever (except Duel).
Go ULTRA! (15 points): Clear all the pegs in a level. It's pretty extreme, but you look up to it (except Duel).
Be Cool (10 points): Hit the last orange then the last blue to rack up a Cool Clear (except Duel).
Free! Free! Free Ball! (15 points): Rack up the score or hit the bucket for 3 free balls in one shot.
Party Master (10 points): Winning a Peg Party is way better than playing with a ball of yarn!
Peggle Graduate (20 points): Complete Adventure Mode and earn your degree from the Peggle Institute.
Peggle Professor (25 points): Complete every level in Challenge Mode and even the Peggle Masters will be impressed.
Rock Lobster (15 points): Win a Xbox LIVE Duel like a crustacean born. 'Ave you tried ze flippers?
Doctor of the Peggle Arts (30 points): Clear all pegs and bricks in every level in Quick Play or Adventure mode and gain explodious fame!
Ace of Adventure (30 points): In a peg defying feat, score 20 million points in a single play-through of Adventure mode.
People's Ovation (10 points): Win a 4-player Peg Party by a whoppin' 100,000 points to acquire everlasting coolness.
Stylish Project (15 points): Bust out all your Skillz, Bounces, and Slides for 1 million style shot points!