Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
100 Kills	You killed 100 zombies!	15
5 In The Corner	You completed five waves while taking on zombies in the 'Cornered' map.	15
Baby Survivor	You have completed your first wave... How cute!	15
Big Spender	You purchased all the skins! You might have a shopping addiction!	90
Bone Hoarder	You managed to collect 1000 or more bones at one time!	90
Challenge Accepted!	Ready for a new fight! You unlocked the 'Cornered' Overloaded map!	30
Cornered? No, You're Cornered!	You survived twenty waves in the 'Cornered' map while in the 'Overloaded' game mode.	90
Fully Loaded	You upgraded your character to the MAX!!!	90
It's Starting To Smell In Here!	20 waves cleared and it's starting to stink! Must be all that zombie guts you're spilling.	90
Lucky #7	You killed seven zombies with just one shot of the space gun!	15
No Mace No Problem	You took out the boss in 'No Escape'! Great job!	15
Not Bad... Not Bad	10 waves, huh? Not bad, kid... but the real fight's just getting started.	30
Not Too Shabby... For A Beginner	You killed 500 zombies. At this point, you're starting to learn!	15
That's A Lot Of Points	You scored over 250,000 points in one round of 'Overloaded'. WOW!	90
Upgraded... Moving On Up!	You upgraded all your skills at least once.	15
Weapons Master	You collected 1500 items while playing in the 'Overloaded' game mode.	55
You Don't Like Zombies	You killed 1000 zombies. That's a lot of zombies!	30
You're A Good Person	You scored over 100,000 points in Pacifism mode.	90
Young Pacifist	You scored 50,000 points in a round of 'Pacifism' mode!	30
Zombies Slayer	You seriously killed 10,000 zombies? WOW. That's some dedication.	90