Unlock Xbox Live Gamerscore points, by completing the following Achievements.

Achievement	How to unlock
Cardiac Arrest! ( 20 points )	Recover X-13 cardiac regulator sneaky suit.
Make Up Your Mind ( 20 points )	Make up your mind... about your brain.
Making Friends ( 30 points )	Reactivate all of the Sink's robotic assistants.
Outsmarted ( 35 points )	Complete Old World Blues.
Spinal-Tapped! ( 20 points )	Recover X-8 vertebrae-pulse-de-sensitizer frequency.