Here is the full list of all 38 Moss achievements.
Collect all of the forgotten fragments.
Destroy a Forged enemy with a controlled Scorcher.
Find a low-hanging path to the town pub.
Destroy two or more Screecher enemies with a controlled Ticker.
Annoy Quill by delaying the adventure.
Rescue Argus without a single death.
Collect all of the Relic Dust.
Use your power as a Reader to break many objects.
Defeat the serpent Sarffog.
Finish the first book of Moss.
Climb to the castle bridge alongside Quill.
Destroy a Forged enemy with an aerial attack.
Break everything within the town pub that can be broken.
Startle Quill from behind.
Collect a large amount of Relic Dust.
Enter the Abandoned City alongside Quill.
Take control over many Forged enemies.
Enter the Namelhook Mining cave alongside Quill.
Use Quill's sword to cut down a lot of grass.
Unlock the path to the Mire Temple's altar room.
Light the torches of the Knights of the Sun.
Collect a small amount of Relic Dust.
Guide Quill to destroy multiple thorn patches.
Give Quill a high five.
Use a Screecher to unlock the path forward.
Enter the Mire Temple alongside Quill.
Defeat the Screechers first encountered in the Mire.
Use your power as a Reader to heal Quill for the first time.
Follow the Starthing and Quill into the impassable Mire.
Enter the Clearing alongside Quill.
Discover your first Forgotten Piece.