I'm so glad to hear you enjoyed our game! As for the Dreams to ashes achievement: you unlock it if you keep the bird letter you find in the grimoire for later. When you return to Ilar the scene where two of you struggle for it ensues and if you are on good terms with them, it results in you seeing the memory together. However, if you are at bad terms with Ilar at that point, something different will happen. Let me know if this helps or if you need a more help.
Viewing post in Chronicles of Taldun: The Remainder（涛敦编年史：残波） comments
Thank you so much for your reply, I unlocked it! ^^ For some reason, I had assumed that this had to do with the shards from the Hermit section of the game.
Anyway thank you again for such a wonderful work, I honestly don't know how you managed to incorporate so many variables and alternative dialogue into the writing. Even after 15+ hours of playtime, I was still discovering new things by just trying different choices, that's amazing.