SEIDEN Achievements Here is the full list of all 18 SEIDEN 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 What are achievement flags? Click to find outApply first infected personfirst kill terrorist bossfirst kill king black caimanfirst kill Mummy Kingfirst kill Mummy 99 kill The first mummy kingThe first mummy king kill frozen soulfirst kill water dragonfirst kill Mutant Tyrannofirst kill Soul of the Fallen Kingfirst kill Another Dimension Scientisfirst kill dark treefirst kill necromancerfirst kill slaughtererfirst kill Scarecrow Ghostfirst kill Void Reaperfirst kill Andromeda Special Forcesfirst kill Rookie Hookfirst kill