[boothby]

All of them? I gave up on that goal partway through the pandemic; I spent about a year's worth of occasional games without seeing Tengu and eventually accepted that I wasn't interested enough to get that 6-challenge badge.

Strategy on Reddit, you say? Perhaps that could help. But, perhaps it's better if I don't spelunk that particular rabbithole.

[Townley]

For the last badge, it wasn't masterful strategy: I played until I got lucky with an overpowered Ring of Wealth run, and farmed the dwarven floors for like 3 days before breezing through the demon halls and ascending. That one and only six challenge run landed with 1,050,700 points, which was just enough to get the final "Over 1 million points" badge.

That was the last round I played, almost a year ago. I consider myself free from the game now, but look back on it fondly :)