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