Here is the full list of all 10 Desolatium: Prologue achievements.
Now you know a bit more about Innsmouth.
You have found all the texts from the game.
You have discovered all the secrets from the graveyard.
You have reached R’lyeh and met Cthulhu.
You were almost caught by a Ghoul.
You talked to a mysterious old lady.
You have used the silver key.
You have managed to combine two objects.
You have seen all the credits. Thank you!
You have finished the game twice.