Full list of all 46 Opus Castle achievements worth 1,195 gamerscore. It takes around 1-2 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 39 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 7 achievements worth 195 Gamerscore.
Achieved all Achievements
Interacted with at least 7 verifiable items
Finished chapter 1 in Álvaro's room
Checked the photo of the Alvaro's bedroom
Had entered into Alvaro's bedroom
Finished chapter 1 in Suit
Collected the pot of mugwort
Checked the photo of the suite
Collected at least one jewel
Had entered the suite
Collected pin 2 of the key
Had the courage to check up the stairs
Finished chapter 1 in the office room
Had collected the gun
Smoked for the first time
Checked the picture of the office
Collected pin 3 of the key
Tried to runaway, but didn't make it
Got run over
Finished chapter 1 in the dinner room
Drank until fall
Drank for the first time
Ate for the first time
Opened at least one drawer
Had entered the dinner room
Collected pin 1 of the key
Interacted with the mirror
Interacted with at least 3 verifiable items
Checked the photo of the hall
Collected the cassette player
Collected at least one item
Found the base key
Played with the goat
Pass the fog
Tried to run, but it' didn't make it
Changed cell phone's wallpaper
Accessed the company's app
Cell phone flashlight activated
Collected the tape
Passed through the quick event without dying
Won the chess match
Collected the invocation tape
Accessed the memory that tells Alice's story
Conviced the mother look through the door
Didn't help Alice to find her doll
Helped Alice to find her doll