Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Ash Williams	Upgrade your Shotgun to the maximum.	50
Beginning	Complete the second episode.	50
Blood bath	Kill 7500 enemies.	75
Bloody rain	Kill thousand enemies.	50
Captain America	Upgrade the defensive walls as much as possible.	50
Desperado	Upgrade your Dual Revolvers to the maximum.	50
Eagle eye	Complete the mission with hundred accuracy.	25
Epilogue	Complete all episodes.	75
Executioner	Take thousand headshots.	50
First Blood	Kill the first enemy.	25
General Thompson	Upgrade your Tommy .45 to the maximum.	50
Gunslinger	Upgrade your Pistol to the maximum.	50
Headhunter	Take hundred headshots.	25
Prologue	Complete the first episode.	25
Star craft	Get eighty stars total.	75
Star wars	Get 120 stars total.	100
Stardust	Get fourty stars total.	50
Starfish	Get ten stars total.	25
Story	Complete the third episode.	50
Terminator	Upgrade your Minigun to the maximum.	50