Here is the full list of all 14 Broken Pieces achievements.
Finish Broken Pieces main story
Obtain all the game's tapes
Send a signal via the communication system in the lighthouse
Complete all the dream portals
Uncover the Devoted secrets
Finish all of george's tables in Saint Exil
Find all souvenir items
Reach the assomption church
Solve the teleporting furnitures puzzle
Find the submarine on the beach
Restore the additional generator in Saint Exil
Finish Broken Pieces in less than 5 ingame days
Get levans key without getting close to the bird
Finish the game 100%