Decay Achievements Here is the full list of all 14 Decay achievements.The base game contains 0 achievements, and there is 1 DLC pack containing 14 achievements.Filter Achievement View View Image viewList view Sort 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 DLC Packs Group DLC packs together in list DLC Filter AllOwnedNone What are achievement flags? Click to find outApply Add-on Unknown Pack 140 140 14 0.0000 (0%) The Solar ElementDiscover all Period 1 elements. The Novel ElementDiscover all Period 2 elements. The Inert ElementDiscover all Period 3 elements. The Hidden ElementDiscover all Period 4 elements. The Strange ElementDiscover all Period 5 elements. The Shining ElementDiscover all Period 6 elements. The Russian ElementDiscover all Period 7 elements. Harness the SunDiscover all Period 1 isotopes. Ever-Growing KnowledgeDiscover all Period 2 isotopes. End of InertiaDiscover all Period 3 isotopes. Secrets RevealedDiscover all Period 4 isotopes. Mystery No MoreDiscover all Period 5 isotopes. A Shining ExampleDiscover all Period 6 isotopes. Pride of OganessianDiscover all Period 7 isotopes.