They updated the world 8 and I realized it is missing in the walkthrough. So here is the solution if you guys are stuck.
Railbound World 8 Walkthrough (2023 Update)
World 8 Main Stage
World 8-1
World 8-2
World 8-3
World 8-4
World 8-5
World 8-6
World 8-7
World 8-8
World 8 Bonus Stage
World 8-1A
World 8-2A
World 8-2B
World 8-3A
World 8-4A
I have no idea how to arrange them so it goes through the green barrier.
World 8-4B
World 8-5A
World 8-5B
World 8-6A
The only stage that gives you so many tracks for no reason. Get your achievement here.
World 8-7A
World 8-8A