Here is the full list of all 24 Twin Mirror achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Explore all the endings
You kept Anna alive by outsmarting your opponent
You've made 60% of your decisions as your analytical self
Leave for pastures new
You've chosen your analytical self
Reconstruct Dennis's murder without help
Play an old favorite
You've made 60% of your decisions as your social self
Stay in your hometown
You kept Anna alive by putting yourself in your opponent's shoes
You've chosen your social self
Finish the "Refuge" scene
Finish the "To catch a fish" scene
Crack the code on Nick's fishing bag on your first try
Find all the mementos
Relive all your memories
Talk to Anna without asking for advice
Finish the "Ghosts" scene
Finish the "Wake up!" scene
Find your way out of the infinite hallway without help
Finish the "Raise a glass" scene
Finish the "Memory lane" scene
Relive one memory
Find one memento