Master Key Achievements Here is the full list of all 15 Master Key achievements.Filter Achievement View View Image viewList view Sort by Won first then by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc What are achievement flags? Click to find outApply AllWonNot wonYOU DIEDMany times. 09 July 2025 - Add a guideMineralogistYou found all of the cristals. 13 May 2025 - Add a guideAudiophileYou found all the discs. 13 May 2025 - Add a guideFullmetal AntagonistSplash. 13 May 2025 - Add a guideHealthyYou reached the maximum of HP. 13 May 2025 - Add a guideBig SwordA big sword made by little guys. 13 May 2025 - Add a guideMaster KeyCongratulations! 13 May 2025 - Add a guideColosseumYou proved your worth in a battle to the death. 12 May 2025 - Add a guideCityYou reached the city. 12 May 2025 - Add a guideHydraAnd make it double. 12 May 2025 - Add a guideShipCrash. 12 May 2025 - Add a guidePotionMakes you all dizzy. 11 May 2025 - Add a guideGhostBoo. 10 May 2025 - Add a guideMoleWhack. 10 May 2025 - Add a guideMaster NonogramYou solved all of the nonograms 29 April 2025 - Add a guide