I completed the Dungeon Duality solo and it took me all day to completed, and I didn't got the Triumph - Solo Thoughtstealer. I can't believe how glitch is the game
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Hey there. It looks like your solo run was a checkpoint run. Did you leave or get disconnected at any point? Unfortunately, the solo and/or flawless triumphs must be completed in one sitting from beginning to end without leaving for any reason.