| Achievement | How to unlock
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|---|
| 100 ways to die (13) | Get killed by everything.
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| 100% (23) | Finished 100% of the game... or did you?
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| 66 hours of Hell (54) | Play SEUM more then 66 hours.
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| 666% (28) | Hell Yeah! Now you can sleep. (Secret)
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| Beat a friend (16) | Top a friends score on the Leaderboard. (Secret)
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| Beer Collector (23) | Return all yours beers.
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| Butt First (13) | Perform Butt First on one level.
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| Devils Time (12) | Finish level in exactly 6.6 seconds.
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| Endless Suffering (20) | Play Endless mode 66 times. (Secret)
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| Extra Sensitive (15) | Set your mouse on fire!
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| Find the Balls (21) | Gotta catch 'em all. (Secret)
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| Firestarter (11) | Shoot fireball 666 times.
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| Hail Satan (23) | Worship the Satan.
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| Hardcore Speedrunner (54) | We salute you! \m/
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| Heliku Master (24) | Perform eight rituals.
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| Hellium (24) | High pitched story. (Secret)
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| Live long and prosper (19) | Be alive longer then 6 minutes.
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| Long Distance Runner (21) | Run 666m in the Endless Mode.
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| One more try (13) | Retry 666 times.
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| RIP (20) | Die 666 times. (Secret)
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| Ritual performed (21) | Complete one Heliku.
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| Speedrunner (17) | Finish one zone in Speedrun mode
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| Swim Like a Fish (14) | Just keep swimming.
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| The Avatar (16) | Master of all four powers.
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| The Balerina (13) | Set balerina score on one level, and be fabulous.
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| The Climber (24) | Win 10 peaks.
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| The Headbanger (15) | Perform head-banging.
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| The Jumper (12) | Jump 666 times.
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| Top 10 (21) | Best of the best.
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