Here is the full list of all 30 SEUM: Speedrunners from Hell achievements.
Finish level in exactly 6.6 seconds.
Jump 666 times.
Get killed by everything.
Shoot fireball 666 times.
Perform Butt First on one level.
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.
Master of all four powers.
Be alive longer then 6 minutes.
Play SEUM more then 66 hours.
Top a friends score on the Leaderboard.
Gotta catch 'em all.
Retry 666 times.
Just keep swimming.
Set balerina score on one level, and be fabulous.
Perform head-banging.
High pitched story.