I didn't make these just to get the achievements, but rather, to make worlds actually worth downloading. All of the worlds in this collection have no mobs/population spawned in(yet), are set to Year 1 Month 1, and work in vanilla. Keep in mind the Debug label for them in-game is only relevant as I use Debug Mode's "PauseOnStart" option pretty much every time I open the game and that's it(I wish it was in the normal Options since I find it rather convenient). You should be able to open them up with no mods or Debug Mode just fine.