Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Kingpin ( 10 points )	Fight off 8 unique players during your time on top during Land Grab in Multiplayer Free Roam.
Mad Marston: The Trail Warrior ( 10 points )	Attain Rank 5 in all Undead Nightmare Challenges.
Smoke that Skinwagon ( 10 points )	Make it to wave 15 in Undead Overrun Gametype in Multiplayer.
Spinning Plates ( 25 points )	Have every territory saved at the same time during the Undead Nightmare.
Zed's Dead, Baby ( 40 points )	Attain 100% Game Completion statistic in Undead Nightmare.