Complete the indicated task to unlock the corresponding costume.
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Successfully complete the main storyline, then collect the indicated Pivot to unlock the corresponding Animus Hack at the "Options" menu.
First complete the game at least once to unlock the ability to collect Animus Pivots in online games. You will obtain three Pivots via in-game tutorial, after which you must find more online by placing your pivots in a triangular formation on each level to locate more; no exact locations can be given because the Pivots you collect were actually placed by another player online before you, but you can discern their general locations from the Map menu. Collect Pivots to unlock cheats which can be enabled in the Options menu under "Animus Hack."
Use the following trick to go from notorious (wanted) to incognito (not wanted) without paying a bribe to the crier or the printer, and without tearing down any posters. Once you are anonymous (unseen by the enemy) you can use "fast travel" and when you do so, you will become incognito.
To change equipment (for example, to use a new sword), enter the "Equipment" screen at a shop. You can now switch items. Note: Some items, such as certain outfits, can be switched in the basement of the homestead manor.
When hunting, if you know an animal is about to make an action on a spot (such as mark a tree or eat a flower) allow it to do so, then kill it. Examine the clue, which should generate after the animal does this, and another animal will spawn somewhere nearby. Use this to increase the number of hunting items acquired. Note: This method is not always successful.
If two or more guards attack you at the same time, press Circle  or B  Xbox 360  . Doing this will result in an action sequence that disposes of all attackers that went at you.