Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Blissful (50 points)	Save the Marshal from the Bliss (Solo Campaign only).
Only You (50 points)	Sucessfully complete the First Trial (Solo Campaign only).
Saving Deputy Hudson (50 points)	Save Deputy Hudson (Solo Campaign only).
Saving Deputy Pratt (10 points)	Save Deputy Pratt (Solo Campaign only).
Saving Sheriff Whitehorse (15 points)	Save Sheriff Whitehorse (Solo Campaign only).
Special Delivery (10 points)	Ensure a baby's safe passage into this world (Solo Campaign only).
The Spark (20 points)	Complete the game intro by liberating Dutch's island (Solo Campaign only).
Together Forever (100 points)	Get to the End (Solo Campaign only).
Walk The Path (20 points)	Discover the Bliss (Solo Campaign only).
You Are Wrath (50 points)	Be deemed the Sin of Wrath (Solo Campaign only).