Here is the full list of all 63 Angels with Scaly Wings achievements.
See the true ending.
Reject Bryce's invitation.
See the evil ending.
See Bryce's good ending.
See Bryce's bad ending.
Listen to a bunch of music.
Stretch your legs.
Examine Bryce's blanket.
Look at Bryce's magazine.
See Lorem's good ending.
See Lorem's bad ending.
Assemble the sphere.
Beat Sebastian at his own game.
See Anna's good ending.
Decide not to meet anyone or investigate 10 times.
See Anna's bad ending.
Do a thing.
Meet with Emera.
See Adine's good ending.
Interrogate Anna.
Look at Anna's envelope.
Answer Anna's questions correctly.
See Adine's bad ending.
See Remy's good ending.
See your first good ending.
Skip ahead 10 times.
Keep the seashells.
Do well in all investigations in a single playthrough.
Do well on the third investigation.
Acquire a map.
Play a prank on Bryce.
Find a mysterious base.
Follow Vara.
Look at Remy's pictures.
See Remy's bad ending.
See what lies beneath the mask.
See your first ending.
See the neutral ending.
Meet with Kevin.
Return the eggs to the hatchery.
Meet with Katsuharu.
Go to the portal.
Help Katsuharu.
Have two messages waiting for you at the same time.
Do well on the second investigation.
Interrogate Damion.
Look at everything the store has to offer.
Find a mysterious orb.
Find a handful of dirt.
Acquire the bloody bandage.
Appreciate the landscape.
Wait for Remy until you get bored.
Get Adine to remove her headgear.
Bring Remy's books into the correct order.
Do well on the first investigation.
Refuse to help Bryce 99 times.
Learn a lot about fruits.
Take a dragon dose of medication.
Read a bunch of books.
Drink a mysterious liquid.
Waste a perfectly good batch of eggs.
Order the daily special.
Give Anna your blood.