All effects part 1:    • How To Get Every Effect In Project So...  
All effects part 2:    • How To Get The NEW Effects In Project...  
All effects part 3:    • How to obtain the 3 NEW EFFECTS in Pr...  
All badges:    • How To Get Every* Badge In Project So...  
Next-Level Thingamabob:    • All the Scrap Cap upgrade locations! ...  

Some notes:
You don't have to worry about the ball falling, as it will be teleported back up near you if it does fall (even when you roll it down some amount).
Both teleports shown at the end send you to Desolate House and Tundra Shoal respectively.