What counts towards 100% in Red Dead Redemption?

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I played the whole game and I'm at 79%. But I can't find anything else to do, what counts to 100% completion? I found all the places, there aren't any side missions that I'm aware. I'm stuck and I'm not sure what else to do. Well, I haven't completed all the challenges in the game, but, I don't think that's the only thing I'm missing.
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What does 100 completion require RDR2?
Red Dead Redemption 2 100% completion requirements checklist- Complete all 107 story missions.
- Complete 10 Stranger mission strands.
- Complete five Bounty Hunter missions.
- Have 25 Chance Encounters.
- Survive a Gang Ambush.
- Clear out all Gang Hideouts.
How Long Does Red Dead Redemption take to 100%?
When focusing on the main objectives, Red Dead Redemption 2 is about 50 Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 174 Hours to obtain 100% completion.Are gold medals required for 100% RDR2?
Complete all story missions. Check out our complete Red Dead Redemption 2 (opens in new tab) guide for the Gold Medal requirements, though these aren't needed for 100%. You'll need to find and complete 10 Stranger missions across the Red Dead Redemption 2 map - indicated by grey question mark icons - and complete them.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Mikhail Nilov, Mikhail Nilov, ArtHouse Studio, Fernando Capetillo