Here is the full list of all 13 She Remembered Caterpillars achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Complete the game
pass any kind of obstacle with two characters simultaneously
stop a character from walking by activating a bridge in its path
activate a colour swapper five times with the same character
pass all obstacles in a single chapter of Act 2 at least twice
switch direction on the beetle bridge ten times without leaving the bridge (inspired by Tony Hawk Pro Skater 2)
reach the initial state of a chapter after changing it 25 times
paint a single character in all primary colours
Select various characters at least five times in a row without ever moving one of them
deactivate the snail bridge right before a character is about to cross it
reach 60 different states in a single chapter
Trigger the same obstacle at least three times
Solve two chapters without activating an obstacle