Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Chapter 1 (20 points)	Finish chapter 1.
Chapter 10 (100 points)	Finish chapter 10.
Chapter 12 (100 points)	Finish chapter 12.
Chapter 14 (100 points)	Finish chapter 14.
Chapter 18 (100 points)	Finish chapter 18.
Chapter 2 (40 points)	Finish chapter 2.
Chapter 22 (100 points)	Finish chapter 22.
Chapter 24 (100 points)	Finish chapter 24.
Chapter 3 (60 points)	Finish chapter 3.
Chapter 5 (80 points)	Finish chapter 5.
Chapter 6 (100 points)	Finish chapter 6.
Chapter 8 (100 points)	Finish chapter 8.