Here is the full list of all 16 Claire achievements.
Have maximum panic.
Make it to the school.
Answer the phone.
Find 3 notes.
Find 3 butterflies.
Unlock the ending.
Unlock the ending on Nightmare.
Unlock the Good ending.
Unlock the Dog ending.
Defeat the Glower.
Find each delinquent scene.
Find all butterflies.
Find all notes.
Find 80 items.
Unlock the otherworld scene.
Make it to the apartments.