Here is the full list of all 27 Masquerada: Songs and Shadows achievements.
Revisit a scene.
Clear the final battle.
Activate 100 Mask abilities.
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.
Defeat the Ancient Feravaro.
Defeat the Matron.
Respec once.
Practice in the Training Grounds.
Defeat the Saltbreather.
Defeat the Antiquarian.
Defeat the Triplets.
Fully upgrade a skill.
Defeat the Greater Bolgia.
Complete the Prologue
Watch the Epilogue.
Collect all the codices.
Trigger 250 Elemental Tags.