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