Here is the full list of all 33 Forgotton Anne achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Don't distill any forgotlings
Overtake Fig
Don't fall during Roof Chase
Collect all mementos
Don't get jumped by lost pieces
Listen to Fig's entire monologue before distilling him
Keep a steady pace while pumping
Overhearing private conversations
Get Magnum to do your dirty work
Get past Tink without tearing her apart
Converse with the Practice Dummy
Instill all fallen rebels
Keep up with Fig
Find way through sewers without getting lost
Don't distill Tiphany
Turn on bedside lamp
Revisit balcony
Discover Rocket
Read 10 diary entries
Say hi to Pavil
Complete game
Examine all books
Collect half of all mementos
Sit on all chairs
Wing-jump 100 times
Speak to all forgotlings at Scrappers
Try on dress
Take 1,000 stair steps
Catch Quill
Examine PAX's secret room
Take CCU to Struct
Collect two mementos
Take a breather in the storage room