Undead Fortress Achievements Here is the full list of all 6 Undead Fortress 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 DEATHDEATH 3X ZOMBIE FIGHTERKill 15 zombies SHADOW KILLERKILL 8 Bioroids FIRST BLOODWin a game on easy difficulty STILL ALIVEWin a game on normal difficulty MAN OF STEELWin a game on hard difficulty