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