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