Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Allergic to First Aid Spray (25 points)	Finish the game without using a First-Aid Spray.
Apprentice of Unlocking (15 points)	Obtain all keys and use them all.
Burned Alive (15 points)	Defeat an enemy by burning them.
Dead, Dead, Deadski (15 points)	Defeat a zombie by stomping on them.
Fashion Plate (15 points)	Change into a costume.
Fileophile (15 points)	Read all files.
Find Time to Combine (15 points)	Combine every type of herb with each other.
From Zero to Hero (25 points)	Finish the game on Hard difficulty.
Guns are Too Quick (15 points)	Defeat an enemy with a knife.
Here I Come to Save the Day (15 points)	Attack an enemy to save your partner who is grappling with that enemy.
I Could Shoot, You Know (25 points)	Obtain all weapons.
I'm a Medic, Not a Bodybuilder (15 points)	Try to push something heavy with Rebecca.
Misdirected Hostility (15 points)	Destroy a zombie's legs.
S is for S.T.A.R.S. (25 points)	Finish the game with rank S.
Save Your Prayers (90 points)	Finish the game without saving.
This is How You Recycle (15 points)	Create a Molotov Cocktail.
This is Serious Business (90 points)	Finish the game without using a recovery item (including Green Chemicals).
Who's Got the Herb? (25 points)	Finish the game without combining herbs.
Zero In (15 points)	Defeat an enemy with a critical-hit headshot.