In Red Dead Redemption 2 there are as many as 90 challenges available. They're divided into 10 categories. On a separate page of the guide we described each of the challenges prepared by the creators and showed you the prize for fulfilling each of the challenges.
The challenges in RDR2 can be extremely unintuitive. In order to unlock the challenges in a given category, you must perform an action that includes the first challenge, e.g. killing someone quietly with a knife. Only at this point will the game reveal the challenge to you. Another challenge of a given type will only be unlocked when you finish first one. The same goes for the third, fourth and tenth challenge. You have to perform all of them in order.
However, you can perform challenges from other categories at the same time. There's nothing to stop you from doing the challenges of an herbalist and a horseman at the same time.
We've made a list to help you unlock challenges:
Bandit - attack a citizen.
Explorer - find a treasure map.
Gambler - win in poker.
Herbalist - collect a yarrow.
Horseman - Kill a rabbit on horseback.
Master Hunter - skin a deer.
Survivalist - catch a fish.
Sharpshooter- Kill a bird in flight.
Weapons Expert - Kill 3 enemies using only a knife.
When you start the challenge, a corresponding icon will appear in the top right corner. Example on the screen above.