Here is the full list of all 10 The Unfinished Swan achievements.
Reach the Watchtower without throwing more than 3 balls.
Launch a blueprint box 15 meters high.
Launch a blueprint box 30 meters high.
Release all balloons.
Reveal every storybook page in the game.
Finish the King's Dream chapter.
Finish the Nighttime chapter.
Finish the Unfinished Empire chapter.
Look at the sleeping King.
Finish the Garden chapter.