The explanation for the achievement itself is pretty clear, but I wanted to say as someone who absolutely doesn’t care at all about going out of my way to obtain every achievement in this that the easiest level to get all five red rings in for me by far has been act four of Asteroid Coaster. It’s basically an on rails level and all the coins are right in the main path. You just have to make sure you’re on the right “track” (row?) to run into them. I got them all on my third attempt. This is also the perfect level to obtain the Reach For The Stars achievement in.