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This achievement is technically easy, but relies heavily on RNG. It took me two hours and three games to get the Runesword with the Devil's Minion character. But all you have to do is just choose to play as that character, and then run around until you're able to pick up the Runesword when you eventually come across it. Easy, but you can also have bad luck like me. Achievement unlocks as soon as you pick it up.