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