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