Here is the full list of all 39 Opus Castle achievements.
Collect the invocation tape
Achieve all achievements
Ending Room of Álvaro
See the photo of Alvaro's bedroom
Drink until fall
Take a deep breath with the cigarette
Enter Alvaro's bedroom
Final Suit
Steal the jewels
Collect the pot of mugwort
See the photo of the suit
Enter the suite
Find pin 2 of the key
Check up the stairs
Final Office Room
See the pictures of the office
Collect the Gun
Collect 3 items
Open the drawers
Find pin 3 of the key
Go to the entrance
Get run over
Ending Dinner room
Interact with 7 verifiable items
Get a drink
Eat a little
Enter the dinner room
Find pin 1 of the key
Collect the cassette player
Interact with the mirror
See the photo of the hall
Interact with 3 verifiable items
Find the base key
Play with the goat
Take a look around on the town
Access the company's app
Change the cell phone's wallpaper
Use your cell phone flashlight
Try to run