Here is the full list of all 28 Verlet Swing achievements.
Earn all perfect rankings in Checkmate, History
Find the Julbock’s hidden entrance!
Complete Crimson Court
I beat the final level and all I got was this crappy achievement
Enter through the goat eye in The Depths
Publish your first level
Create your first level
Complete a challenge
Complete Wondercon 1998
Complete Nimis Non Laute
Hook something extremely far away
Complete Mobymart
Die while moving really fast
Reach more than 130 km/h
Die more than 50 times on a level in a single go
Complete Checkmate, History
Earn your first perfect ranking
Earn half of all available perfect rankings
Earn all available perfect rankings
Earn all perfect rankings in Mobymart
Earn all perfect rankings in Nimis Non Laute
Earn all perfect rankings in Wondercon 1998
Earn all perfect rankings in Crimson Court
Complete half of all available challenges
Complete all available challenges
Complete the Hardcore Marathon challenge
Earn all achievements
Complete the Marathon challenge under 15 minutes