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