u/Nonsenser

It's not even hard, just a boring slog that will be 99.9% of the playtime in the game for achievement hunters.

EDIT: I am always amused by how criticism and feedback offends gamers. This is why the industry is where it is. People are tone policing me for saying the words "boring slog", which this achievement clearly is. I am sure the devs would agree. I want the game to be better and more fun when all the content is done, that is all.

I would suggest these fixes:

1. hard mode challenges. All challenges are pressure 15-20. If you complete a hardmode challenge, you get the tick in normal mode as well.
2. Even faster game speed option in challenges.
3. Optional way to skip straight to the next boss in challenges.