Activate the following cheats by entering the corresponding codes in the Cheats Menu under "Options." Enter the entire phrase given below, punctuation included. Capitalization does not matter. Once a cheat is entered you may toggle them from a master list. If the cheat effect isn't made obvious by its title, we give a description of it in parenthesis below. Note: Entering cheats disables saving and unlocking trophies:
CHEAT FUNCTION - CHEAT CODE
All Guns - WE NEED GUNS JOHN!
Always drunk - I'M DRUNK AS A SKUNK AND TWICE AS SMELLY
Become a nobody. - HUMILITY BEFORE THE LORD
Decrease Bounty - THEY SELL SOULS CHEAP HERE
Diplomatic Immunity - I WISH I WORKED FOR UNCLE SAM
Enable the Sepia filter. - THE OLD WAYS IS THE BEST WAYS
Fame - I AM ONE OF THEM FAMOUS FELLAS
Get $500. - THE ROOT OF ALL EVIL, WE THANK YOU!
Good Guy - IT AINT PRIDE. IT'S HONOR
Gun Set 1 - IT'S MY CONSTITUTIONAL RIGHT
Gun Set 2 - I'M AN AMERICAN. I NEED GUNS
Infinite ammo - ABUNDANCE IS EVERYWHERE
Infinite Dead Eye - I DON'T UNDERSTAND IMNFINITY
Infinite Horse Stamina - MAKE HAY WHILE THE SUN SHINES
Invincibility - HE GIVES STRENGTH TO THE WEAK
Man in Uniform - I LOVE A MAN IN UNIFORM
Play As Jack - OH MY SON, MY BLESSED SON
Sharp Dressed Man - DON'T YOU LOOK FINE AND DANDY
Spawn a horse-drawn coach. - NOW WHO PUT THAT THERE?
Spawn a horse. - BEASTS AND MAN TOGETHER
Unlock all areas. - YOU GOT YOURSELF A FINE PAIR OF EYES
Unlock All Gang Outfits - YOU THINK YOU TOUGH, MISTER?
No cost item building:
If you complete Undead Nightmare with a 100% rating, you can build Undead Bait, Boom Bait, Phosphorus Coating, and Blunderbuss Ammo for free.
Undead Treasure Hunter locations:
To start the Treasure Hunter quests, find your first map at a camp site outside of McFarlane ranch. It will appear randomly inside a chest. After that, use the map and the descriptions below to find the treasure:
RANK - LOCATION
Rank 1 - ???
Rank 2 - go to Vente's Place near Lake Don Julio and easily make your way by the mountains to find this easy treasure.
Rank 3 - Head to The Scratching Post, the camp where you meet the soldiers that give you the army uniform. Up the mountains, easy.
Rank 4 - Head to Sepulcro graveyard in Mexico, just south of there are a pair of tress, head past them to reach another bunch, search the area.
Rank 5 - Head to Casa Madrugada in Mexico, follow the map along the mountains and if you climb on foot on a cliffy part you'll find your treasure.
Spinning Plates - Have every territory saved at the same time during the Undead Nightmare.
Mad Martson: The Trail Warrior - Attain Rank 5 in all Undead Nightmare Challenges.
Smoke that Skinwagon - Make it to wave 15 in Undead Overrun Gametype in Multiplayer.
Kingpin - Fight off 8 unique players during your time on top during Land Grab in Multiplayer Free Roam.
Zed's Dead, Baby - Get a 100% game completion in Undead Nightmare.