Nightmare Achievements Here is the full list of all 10 Nightmare 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 Wake upWin one game Eternal sleepLose one game Faster than the windUse a Portal Mystical activityUse a Boost Area First friendBurn a Loot Ghost Great meetingBurn a Patrol Ghost Nice tryBurn an Attack Ghost Great startPlace your first Light Source ElusiveDon't get caught by the Sleep Demon SpeedrunGain the victory under 15 minutes