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 wonFullmetal AntagonistSplash. 15 February 2026 - Add a guideMaster KeyCongratulations! 15 February 2026 - Add a guideBig SwordA big sword made by little guys. 15 February 2026 - Add a guideColosseumYou proved your worth in a battle to the death. 15 February 2026 - Add a guideMaster NonogramYou solved all of the nonograms 15 February 2026 - Add a guideHydraAnd make it double. 08 February 2026 - Add a guidePotionMakes you all dizzy. 06 February 2026 - Add a guideCityYou reached the city. 05 February 2026 - Add a guideShipCrash. 05 February 2026 - Add a guideGhostBoo. 31 January 2026 - Add a guideMoleWhack. 30 January 2026 - 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 guideYOU DIEDMany times. Locked - Add a guide