I was playing on a new file (my old one was on my laptop that died, and I never backed it up on a cloud-saved text doc. I had the Dungeons achievements!), and 3 hours, 40 minutes in, I got Just Plain Lucky. I haven't even completed Hardcore yet (did get True Neverclick, though), and it was quite the surprise. I'm curious to see if anyone has gotten it any sooner.