Master hunter 6: Kill 5 cougars with your bow, then skin them.
The prerequisite of this challenge is that you have to complete Chapter 1. The rewards are 100 Health XP and $15.
This guide will let you know how to complete the Master hunter 6 challenge in Red Dead Redemption 2.
In the north area of west Elizabeth, the black bone forest is a common spawn area for cougars.