My Lucky Day

Win a single Daily Climb. The Daily Climb is a fixed seed with a set of random modifiers (some helpful, some nasty) that everyone plays that day, launched from the main menu. You just need one winning Daily run - reach and beat the Act 3 boss; the true ending isn't required. Pick a day whose modifiers look kind, play safe and steady, and you'll get it. You can attempt a fresh one every day, so there's no rush.