Undergod Achievements Here is the full list of all 27 Undergod 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 Boss Slayer IDefeat the Scout. Boss Slayer IIDefeat the Announcer. Boss Slayer IIIDefeat the Protector. Boss Slayer IVDefeat the High Watcher. Boss Slayer VDefeat the Fallen. Boss Slayer VIDefeat the Archangel. Boss Slayer VIIDefeat the Catcher. Boss Slayer VIIIDefeat the Gluton. Boss Slayer IXDefeat the ninth boss. Boss Slayer XDefeat the tenth boss. Boss Slayer XIDefeat the eleventh boss. Boss Slayer XIIDefeat the twelfth boss. Angel Slayer IKill 10k angels. Angel Slayer IIKill 40k angels. Angel Slayer IIIKill 80k angels. Angel Slayer IVKill 160k angels. Monster IDeal 1 billion damage in a single run. Monster IIDeal 2 billion damage in a single run. Monster IIIDeal 5 billion damage in a single run. Monster IVDeal 10 billion damage in a single run. Heretic IDeal 10 million damage to a boss. Heretic IIDeal 50 million damage to a boss. Heretic IIIDeal 120 million damage to a boss. Highlander IStay alive for 10 minutes. Highlander IIStay alive for 20 minutes. Highlander IIIStay alive for 30 minutes. Highlander IVStay alive for 40 minutes.