Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
1UP! (20 points)	Level up during a stage.
And you, Brutus? (20 points)	Kill your partner.
Barrel Master (50 points)	Create a PWNAGE of your choice with a barrel.
Chaaaarge! (20 points)	Charge Cye's Boost bar completely and use it.
Chrome The Builder (50 points)	Reach the limit of built turrets in a stage.
Chrome the Destroyer (20 points)	Charge Chrome's Boost bar completely and use it.
Critical Mass (20 points)	Finish a stage with critical health level.
Cye-pper (50 points)	Reach the limit of planted traps in a stage.
I'm a Big Boy now! (50 points)	Compete a level without building turrets.
I've Got The Power! (50 points)	Buy all upgrades of a single power.
Last Man Standing (20 points)	Finish a stage when one character is down.
Master Engineer (120 points)	Buy all upgrades to all the turrets.
Overpowered (50 points)	Compete a level without buying powers.
Rise, Lazarus! (20 points)	Respawn your partner.
The Beat-em-alls (150 points)	Beat all levels.
Three-Way Pwnage (120 points)	Create at least one PWNAGE of each kind during a stage.
Turret Syndrome (50 points)	Buy all upgrades of a single turret.
Unlimited Power! (120 points)	Buy all upgrades to all the powers.