Here is the full list of all 30 SEUM: Speedrunners from Hell achievements.
Just keep swimming.
Die 666 times.
Complete one Heliku.
Best of the best.
Master of all four powers.
Retry 666 times.
Perform head-banging.
Shoot fireball 666 times.
Jump 666 times.
Set balerina score on one level, and be fabulous.
Perform Butt First on one level.
Get killed by everything.
Finish level in exactly 6.6 seconds.
Get the "Über Skull" time on one level.
Finished 100% of the game... or did you?
Hell Yeah! Now you can sleep.
Win 10 peaks.
Set your mouse on fire!
Worship the Satan.
Play Endless mode 66 times.
Return all yours beers.
Finish one zone in Speedrun mode
We salute you! \m/
Perform eight rituals.
Run 666m in the Endless Mode.
Be alive longer then 6 minutes.
Play SEUM more then 66 hours.
Top a friends score on the Leaderboard.
Gotta catch 'em all.
High pitched story.