Click here for the full 100% completion strategy guide: https://gtaforums.com/topic/922595-rdr2-100-completion-strategy-guide/
Key points
0:22 - Catch a train from any station to Wallace Station
1:35 - Rob the train on arrival
1:55 - Check it has registered (only need to rob one person) and flee
2:30 - Head down the train tracks to lose wanted level
3:12 - If you run into the law, head across the river into the next state.
3:48 - Wanted status lost
6:41 - Catch the train from Riggs Station to Wallace station to rinse and repeat.
7:48 - Next robbery
8:30 - A reminder not to do this on low health and dead eye in case your horse panics and runs away.
9:59 - Wanted level lost
11:59 - Back at Riggs Station to by a ticket to Wallace Station and rinse and repeat
13:00 - next Robbery
13:28 - flee, you'll need to do this twice more than shown in the video.
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