Here is the full list of all 27 Masquerada: Songs and Shadows achievements.
Respec once.
Revisit a scene.
Watch the Epilogue.
Clear the final battle.
Listen to all of Vasco's optional dialogues.
Listen to all of Kalden's optional dialogues.
Listen to all of Amadea's optional dialogues.
Listen to all of Tiziana's optional dialogues.
Collect all inks and runes.
Defeat the Brehon.
Win the duel.
Defeat the Ridiro Queen.
Defeat the Mangiatore.
Listen to all of Leventhos' optional dialogues.
Defeat the Chimera.
Trigger 250 Elemental Tags.
Defeat the Ancient Feravaro.
Defeat the Matron.
Practice in the Training Grounds.
Defeat the Saltbreather.
Fully upgrade a skill.
Defeat the Antiquarian.
Defeat the Triplets.
Defeat the Greater Bolgia.
Complete the Prologue
Collect all the codices.
Activate 100 Mask abilities.