Undiscovered perk

[Rango]

I have crafted all of the trinkets and talismans, have the farm, field, and falconry book, ancient arrowhead and the owl trinket, yet still have an undiscovered perk in the player general list.  I have the standard copy, so I know there are 2 in the other versions.  It is not those.  Anyone know what the last perk is?  It is the last one in the list.  I have not completed the Gambler, Horseman or Sharpshooter challenges.  I cannot find a complete list of the perks.  Only references to the trinkets and talismans.

[Kean_1]

Are you talking about in the campaign?

[ArthurMarston91]

Legend of the east perk you get it after completing all 90 challenges 9 categorys 10 challenges each,hard but worth it.

 

[Rango]

Thanks!!

 

[Limey77]

Having replayed the entire game for a third time I am finally looking to 100% everything in the game. But I've suddenly encountered this. I have every trinket, talisman etc, etc.. just wondering what this missing perk is.

Any ideas?

[Shane262]

It appears you are missing the trinket that the indian elders gives you. He gives it to you if when you go get his sacred trinket from the army camp without killing anyone. You must not kill anyone to get it and he gives you a pretty solid perk trinket. The eagle something trinket which slows all core drain on arthur by 10%