Unlockable: Silver Spurs
Finish all Pony Express Missions.
Unlockable: Reed's armored horse and Macgruder's cannon shotgun
Finish story mode and all side missions for 100% completion. Then go to Macgruder mine to pick up your rewards.
Unlockable: Upgraded Nock Gun
Finish the main game and all sidequests.
Unlockable: Apache Shirt
Finish the Hunting Missions.
Hint: 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.
