Gun Showdown
Enter the following to unlock the corresponding:
allies – Unlocks Jenny
barton – Infinite Ammo (Story Mode)
campbell – Increased ammo capacity
hunter – Every character unlocked (Quick Play Mode)
nedwhite – Every weapon unlocked (Story Mode)
quivira – Rapid fire
Weapons:
.69 Ferguson Rifle: Defeat Hollister
Cavalry Sword: Defeat Reed
Dual Peacemakers: Defeat Hoodoo Brown
Bear Hunt
Get 60 or more points on Suppress The Outlaws.
Fire Fight
Get 35 or more points on Bear Hunt