You can do Full Medal runs in one go by abusing the glitch that deactivates the in-game timer. However, it does activate if you go through the portal to the obsidian skull, so you'd have to do that as the last thing in a level to have enough time left for the full medal.

Not sure if this is applicable to each and every stage, but it does make Full Medal Runs more viable, since you wouldn't have to do each level twice.

I noticed that all stages does not include the Kiwi section. I realize the game isn't very actively run atm, but maybe that warrants an additional category?