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. 06 February 2026 - Add a guideShipCrash. 02 February 2026 - Add a guideGhostBoo. 15 March 2025 - Add a guideMoleWhack. 15 March 2025 - Add a guideHydraAnd make it double. Locked - Add a guideMaster KeyCongratulations! Locked - Add a guideFullmetal AntagonistSplash. Locked - Add a guideAudiophileYou found all the discs. Locked - Add a guideMineralogistYou found all of the cristals. Locked - Add a guideHealthyYou reached the maximum of HP. Locked - Add a guideBig SwordA big sword made by little guys. Locked - Add a guideColosseumYou proved your worth in a battle to the death. Locked - Add a guideMaster NonogramYou solved all of the nonograms Locked - Add a guidePotionMakes you all dizzy. Locked - Add a guideCityYou reached the city. Locked - Add a guide