Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
100 Enemies	Defeat hundred enemies.	100
200 Enemies	Defeat 200 enemies.	100
50 Enemies	Defeat fifty enemies.	50
All Tools	Collect all tools.	50
All Weapons	Collect all weapons.	50
Battle On The Bridge	A fateful encounter on a bridge.	75
Crawler	A fateful encounter from below.	75
First Weapon	Collect your first weapon.	50
God's Head	A fateful encounter with the unknown.	75
Horror From Above	A fateful encounter from above.	75
Max Ammo	Upgrade your ammo to the maximum.	50
Max Health	Upgrade your health to the maximum.	50
That's it	That's all there is.	100
You Cannot Redo	What else is there to do?	100