Hidden Boxes Achievements Here is the full list of all 6 Hidden Boxes 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 Seeker WinnerWin 5 matches as seeker Prop WinnerWin 5 matches as prop WhistleUse whistle 10 times InvisibilityUse invisibility ability five times MatchesPlay five matches ScanUse scan ability five times