.69 Ferguson Rifle
Defeat Hollister.
Apache Shirt
Successfully complete the Hunting missions.
Defeating Hollister
Sneak up on Hollister and shoot him once. Then, run off and get behind a rock on top of risen ground in the middle of the arena. When he is circling the rock you are behind, start circling as well. He will eventually stop and yell at you to come out. He should pace back and forth slowly while you hide behind the rock. When he stops and is not facing you, shoot him in the head. Perform this until the point that he becomes too smart to fall for it again. By then his health should be low enough so that you can run out and keep shooting while strafing. After you have gotten his health down all the way there will be a intermission sequence. Look at your compass at the bottom of the screen. He is the red dot. Find him and he will run at you. Run, but keep firing at him with your pistols and he will die.
Defeating Reed
Never let Reed out of your sight. If he is by himself and you cannot see him, he will gain health.
Dual Peacemakers
Defeat Reed.
Easy health
Go to Dodge City, then go to the lower part of the bridge. Follow the path on the other side to reach a beach cave. Look inside for a life power-up which will reappear over time after you leave the area. Note: The cave also contains ammunition and money.
Go to Hecht Ranch, then go to the shack next to the windmill. There you will find three whiskey bottles which will reappear over time after you leave the area.
Easy money
You can earn more money on the bounty hunter side missions by capturing bounties alive. When you find a wanted poster that offers more money if you capture them alive and are having trouble doing so, use the following trick. Kill all gang members or bodyguards (if any). If the bounty is on a horse, kill the horse. Get close and melee attack. This will stun the fugitive and present an opportunity to grab them. Then, subdue the fugitive. This will award you more money for each bounty. If you accidentally release him, you can try to melee him and grab him again. However, if you do this too many times or if he has been shot, you may kill him and get less money.
Faster riding
Hold Dash while repeatedly jumping your horse to travel about double the speed.
Infinite ammunition
Take a barrel of TNT from the Badlands mine. Locate the abandoned house in the Badlands where the buffalo graze. Go to the back of the house on the outside. Face the chimney (looking west) and place the TNT barrel on the left side of the chimney. Blow up the TNT barrel to open a hole in the ground with unlimited ammunition for all weapons.
New Game +
Complete the game and return to the starting area (Blackfoot Territory). From the LEFT of the HIGHER boulder leading up to a ledge and gap, jump and spur your horse so it lands on top, then onto the ledge. Cross the next two areas. Stand between the only two rocks in the water. Press and hold LTrigger+RTrigger+A for a few seconds until you hear a strange sound. Go to Options (press START),for a new selection - GUN. Choose any Mission or Cutscene. You will retain ALL weapons, items, and skills.
Quarry Respawn
If you scared off the quarry in the Hunt side-missions, just remember where it was and go to the nearest trader. After you talk to him and return to where the animal disappeared, it will be there again.
Silver Spurs
Successfully complete the Pony Express missions.