Here is the full list of all 16 Dark Grim Mariupolis achievements.
Finished the prologue.
Solved the RGB puzzle.
Defeated the Viking Guard
Defeated the Laser Cat
Repaired and scavenged the robots.
Opened the Naropolus' door
Finished the game
You can take your time.
Solved the cross-smile puzzle in an unusual way
This book is pretty interesting, isn't it?
Challenged Pentatonic's priest for a duel
Finished the game without killing Sergio.
Died the first time
Died the second time
Win all the duels
There will be no more death-in-a-duel achievements.