In Assassin’s Creed: Brotherhood for the PS3, Xbox 360, and PC, you can the Feathers map for purchase from the Art merchant to make your collection process a bit easier.
To unlock the Feathers map, you’ll need to collect 25 Borgia flags, or beat the game.
Check out my other guide for a full list of unlockable maps.
Assassin’s Creed IV: Black Flag – Hideout Upgrades Guide
Grand Theft Auto V – Submarine Parts Locations Guide
Metal Gear Rising: Revengeance Unlockables Guide for All Blades, Weapons, Outifits, and Wigs
Sacred 3 – Tips & Tricks Guide
Battlefield 4 – Collectible Weapons Guide