Here is the full list of all 11 Atlas Negro: Infernum Demo achievements.
Finish the demo
Unlock the entrance to the crypt
Activate all monitors in the security room
Enter the wrong code three times to open the security room
Groovy!!
It’s always a good time to drink
Yer fond of me lobster!
Interact with the statue guarding the security room
Collect all audio tracks
Collect all the tarot cards
Gather all the offerings