Here is the full list of all 20 The Town of Light achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Unlock Chapter 12d
Unlock Chapter 12c
Unlock Chapter 6b
Unlock Final chapter
Find all the drawings
Taste of Tuscany wine
Someone is freshen
They used to work in the garden
Finally, a place to rest
Unlock Chapter 12a
Unlock Chapter 12b
You know the truth
He still has a name
Find all of Renée's diary entries
Life thrives there
They try to hold the pieces together
Unlock Chapter 6a
Unlock Chapter 5
Find the first part of Renée's diary
A secret place under the massive wall