Complete each achievement to get the allotted gamerscore. The numbers between the () is the points given for each achievement.
|Achievement||How to unlock|
|Spinning Plates (25)||Have every territory saved at the same time during the Undead Nightmare. |
|Zed's Dead, Baby (40)||Attain 100% Game Completion statistic in Undead Nightmare. |
|Mad Marston: The Trail Warrior (10)||Attain Rank 5 in all Undead Nightmare Challenges. |
|Smoke that Skinwagon (10)||Make it to wave 15 in Undead Overrun Gametype in Multiplayer. |
|Kingpin (10)||Fight off 8 unique players during your time on top during Land Grab in Multiplayer Free Roam. |
|Secret Achievements||- |
|Six Years in the Making (10)||Find and kill a sasquatch. |
|Judge A Man By The... (30)||Complete "Cure For Most of What Ails You" and "Get Back in that Hole, Partner" Survival Missions. |
|The Downward Spiral (10)||Complete "Curious Tales from Blackwater, USA" Survivor Mission. |
|All's Right With the World (25)||Complete "On a Pale Horse". |
|The Superior Dance (10)||Complete "Mother Superior Blues" Survivor Mission. |
|Fan Service (10)||Find and break a unicorn. |
|Chupathingy (10)||Find and kill a chupacabra.|
Achieve 100% Completion in Undead Nightmare to make Phosphorus coating, Blunderbuss ammo, Undead Bait and Boom Bait completely free to produce.