Halcyon Achievements Here is the full list of all 20 Halcyon 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 NOPE!Defeated the Crawler Boss for the first time. Two Birds, One StoneDefeated the Nirds Boss for the first time. Open SeasonDefeated the Spider Deer Boss for the first time. For The Federation!Completed the game for the first time. Hardcore.Completed the game on Hard Difficulty. Masochist.Completed the game on Nightmare Difficulty. Inhuman HalcyonCompleted the game on Ultra Nightmare Difficulty. Who Needs Em'?Completed the game without touching a checkpoint. While Supplies Last!Completed the game without resupplying. PacifistComplete the game without using any attacks. ExplorerFind every resupply crate in one run. Earth Federation LibrarianCollected all the entry logs in one run. FRAGILE!Complete the game without getting hit. I Eat Monsters For Breakfast!Get 1,000 total kills. You're a Madman!Get 10,000 total kills. You're a Monster!Get 100,000 total kills. Time TrialComplete the game in under 30 minutes. Fastest Wo(Man) in MothershipComplete the game in under 15 minutes. I Am Speed!Complete the game in under 10 minutes By the Skin of Your TeethDefeat Adam with only 1 HP remaining