Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Level 4	Complete level 4.	50
Level 8	Complete level 8.	50
Level 12	Complete level 12.	50
Level 16	Complete level 16.	50
Level 20	Complete level 20.	100
Level 24	Complete level 24.	100
Level 28	Complete level 28.	100
Level 32	Complete level 32.	100
Level 36	Complete level 36.	100
Level 40	Complete level 40.	100
Level 45	Complete level 45.	100
Level 50	Complete level 50.	100