Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
A friend in need	Revive other players fifty times.	15
A gross gross	Survive 144 waves in total.	30
All of this has happened before...	Complete Molten Nightmare on any difficulty.	15
All roads lead to Rome	Complete All Roads Lead To Hell on any difficulty.	15
Blood splattered	Reach rank 5.	15
Chain reaction	Kill fifty Zombies in a row without missing a shot.	15
Choo choo!	Complete Dead Ahead on any difficulty.	15
Cleanup on aisle four!	Kill a Suicider with his own explosives.	15
Come and get it! It's a running buffet!	Kill 20+ enemies with 1 explosive.	35
Cranial blowout!	Get an unbroken 10-headshot streak.	15
Double tap	Finish a level with five or less zombies resurrecting.	30
Every bullet counts	Get three headshots with one bullet.	30
Give me something to shoot!	Kill a Sniper whilst they are jumping between vantage points.	20
Gold	Earn a Gold Medal on any chapter.	15
Gore soaked	Reach rank 50.	30
Got your back	Kill fifty enemies that are actively attacking other players.	15
Gotcha, didn't I?	Kill all Zombie Hand collectibles.	15
Groovy	Change your characters appearance, such as with a hat or costume.	15
Hail to the king, baby!	Reach rank 100.	50
He did Nazi that coming	Complete Hell Machine on any difficulty.	20
Hoarder	Find all Journals, Comics, and hidden Weapon Upgrade Tokens.	15
I can do anything I want, I got guns	Complete the weapon mastery for three weapons.	30
I never liked them anyway	Kill a friend who has resurrected as a zombie.	15
I told you we should have gone to the beach	Complete consecutive twelve Waves and escape from the Horde Map "Dead in the Water".	15
I'm a survivor!	Complete twenty waves in a row on any Horde Map.	30
In the dark dark woods...	Complete Rotten Coast on any difficulty.	15
Into the deep	Complete consecutive twelve Waves and escape from the Horde Map "Into the Darkness".	15
Is it over?	Complete the Campaign on any difficulty.	15
Just me and my trusty sidearm	Reach wave six on any Horde Map without picking up a Primary or Secondary weapon.	20
Kill of the week	Drop a pallet of Artillery Shells on a Zombie.	25
Leave the limbs you've lost	Sever 10,000 limbs.	30
Look mummy! A shark!	Complete Zombie Zoo on any difficulty.	15
Not today you won't	Complete consecutive twelve Waves and escape from the Horde Map "The Bitter End".	15
Say goodbye, creep!	Kill a Zombie using the Blade Melee Special Attack.	15
Send me an angel	Perform all Heroic Actions.	15
Shock therapy	Kill twenty zombies with Electric Punch Special Attack.	15
Shoot it, man! Shoot it in the head!	Headshot a Zombie post resurrection.	15
Stand back boy!	Kill three enemies with one blast from a Preacher.	15
Take a little bit of Italy with you	Complete consecutive twelve Waves and escape from the Horde Map "Villa Della Morte".	15
Take them down screaming	Perform a takedown on a Blind Screamer.	20
That's a lot of them, and only four of us	Complete every campaign level with a full team of four players.	30
The bigger they are...	Kill five Heavies with Takedowns.	15
The boat can leave now... tell the crew	Complete Death Canal on any difficulty.	15
This is no Sunday School picnic!	Complete the Campaign on Hard difficulty.	30
Weapons expert	Complete the weapon mastery for any weapon.	15
Weird science	Complete Meat Locker on any difficulty.	15
Well equipped	Complete a level with five Gold Level Perks equipped.	15
What did you say, Blain?	Complete four level sections without using a medkit.	15
You're all going to die down here	Complete Hell Base on any difficulty.	15
You've got red on you	Perform fifty Takedowns in total.	30
Zombie killin' machine	Kill 5000 enemies of any kind.	15