Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Lonely Victory ( 20 points )	Clear Episode 1 in 1P Play.
A Temporary Peace ( 20 points )	Clear Episode 2 in 1P Play.
A Trustworthy Friend ( 10 points )	Clear an Episode with the assistance of a friend.
Certificate of DOH ( 25 points )	Clear the first 30 Rounds of Episode 1 without continuing.
Certificate of Bones ( 25 points )	Clear the first 30 Rounds of Episode 2 without continuing.
The First Step (Episode 1) ( 10 points )	Clear the first 10 Rounds of Episode 1 without continuing.
The First Step (Episode 2) ( 10 points )	Clear the first 10 Rounds of Episode 2 without continuing.
The Master Marksman ( 10 points )	Destroy large numbers of Enemies!
The Mock Battle Specialist ( 15 points )	Defeat the computer.
The Nimble Vaus ( 20 points )	Master the Mini-Vaus!
The Piercing Light ( 20 points )	Master the Power Laser!
The Real Battle Specialist ( 15 points )	Combat rivals from around the world!