Turn an altar.
Scare more than 10 chocos back to their burrow.
Hug the ballast.
Activate a fresco.
Complete a cairn.
Listen to a shell.
Read a letter.
Obtain all trophies in the game.
Read all letters.
Complete the game.
Hug the ballast 20 times.
Stop 25 pebbles with a single echo from the ballast.
Read all of Bianca's journal entries.
Use the echo on a frozen ballast in Chapter 6.
Listen to all shells.
Turn all altars.
Activate all frescos.
Complete all cairns.
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