Here is the full list of all 21 High Hell achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Speedrun the game in 20 minutes or less.
Get a global highscore of over 3,300,000 points.
Get 15:00 or less on the best times sum.
Burn everything.
Score a goal.
Found all the DMEN dolls.
Found ten DMEN dolls.
Beat the game.
Excel at a workout.
Killed all the pups.
Beat level 15.
Beat a level in under 5 seconds.
Get killed in the tutorial level.
Beat level 10.
Beat level 7 without being shot.
Beat Professor Meth without killing any chimps.
Die in under 5 seconds.
Found the first DMEN doll.
Beat level 05.
Beat level 2 without shooting.
Steal the Soulshot.