Stairway Achievements Here is the full list of all 3 Stairway achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.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 anomalyYou have successfully discovered the first anomaly Exit the buildingYou have successfully got out of the building All anomaliesYou have successfully discovered all the anomalies!