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