Here is the full list of all 30 The House of Da Vinci 3 achievements.
In the Zodiac minigame on the astrology counter in the eighth chapter, arrange all Sagittarius discs on the left and all Capricorn discs on the right.
Find every possible death in the safe minigame in the fourth chapter.
Use the letter opener in the first chapter without using the Oculus Perpetua.
Inspect a suspicious letter at the first opportunity.
Read the final, complete version of Giacomo's Chronicle in the main menu.
Finish the game in under 11 hours.
Finish the final chapter.
Find a uniquely mysterious place and record it in your diary in the final chapter.
Complete all sketches in your diary in all chapters in a single playthrough.
Finish the eighth chapter.
Put out the flames of the past in the eighth chapter.
Finish the seventh chapter.
Pick up the stepladder in the seventh chapter.
Finish the sixth chapter.
Finish the fifth chapter.
Find a sketch of a secret passage in the fifth chapter.
Break into the pope's study in the fifth chapter without using the Oculus Perpetua.
Finish the fourth chapter.
Infiltrate Borgia's hideout in the fourth chapter.
Finish the third chapter.
Finish the second chapter.
Shoot all the required targets in the second chapter.
Finish the first chapter.
Block the rats from getting into the catacombs in the first chapter.
Find a new notebook in the first chapter.
Complete all records in your diary in all chapters in a single playthrough.
Collect all letters and notes in your diary in all chapters in a single playthrough.
Complete all diary-related achievements in a single playthrough.
Finish the game in under 8 hours.
Finish the game in under 5 hours.