Follow the indicated steps to earn the corresponding Steam achievement. To view your achievement progress and stats, open the Steam client, select "Community", then search for the game hub for "Soft Body (PC)". Click the "View Stats" option in the drop down list, then select the option that displays the achievements for your account.

Achievement	How to unlock
A New Feeling	Find the opera.
Body Pedagogy	Complete all 25 Hard Game levels.
Fun and Love	Complete 15 Hard Game levels.
Islund and Eyn	Defeat Islund and Eyn, the two snakes.
Rooster	Complete Soft Game.
Rooster 100	Complete Rooster 100.
The Circle	Start from Chapter 1-1 and complete every Soft Game level without your Soft Body taking damage.
The Perennial Body	Complete all 25 Hard Game+ Levels.
Triangle Prince	Defeat the Triangle Prince.