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 30 meters high.
Launch a blueprint box 15 meters high.
Reveal every storybook page in the game.
Release all balloons.
Finish the King's Dream chapter.
Finish the Nighttime chapter.
Finish the Unfinished Empire chapter.
Look at the sleeping King.
Finish the Garden chapter.