Infinifactory

Phenomenal game, lots of great workshop levels. However, if you're lazy, you can get this achievement (and subsequent Workshop Master achievements) in a few minutes with some no-input automatic-solution levels. This guy made 20 of them, so you can subscribe to all of his levels and then quickly go through them in game. https://steamcommunity.com/id/Jurk0wski/myworkshopfiles/?appid=300570&p=1&numperpage=30

Expanding on Mercury's guide, here's a workshop collection for one-click subscribing to all of these maps:

https://steamcommunity.com/sharedfiles/filedetails/?id=2716910637