Fortified Achievements Here is the full list of all 23 Fortified 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 Negative PerspirationSurvive 10 waves of Invasion Mode Cloud NineSurvive to wave 20 in Invasion mode on hard