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