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