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