Full list of all 25 Dark Grim Mariupolis achievements worth 4,000 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements in the base game.
The base game contains 10 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 3,000 Gamerscore.
Finished the game
Stay at peace.
Opened the Naropolus' door
Be victorious any time.
Be victorious for a second time.
Be victorious.
Repaired and scavenged the robots.
Ask the priest for a duel.
Solved the RGB puzzle.
Finished the prologue.
Talk to the Chief.
Talk to the Pentatonical Priest
Open the door of your house with a key
Talk to the Dinosaur Head.
Escape through the Bar shelf.
Wait for an elevator for a while
Tune the piano
Intimidate your PC with a hammer
Get the Game Over screen
Ask the Fugu for advice 5 times in the same location
Solve the Cube puzzle
Solve the random numbers puzzle
Talk to the Kiryat priest
Talk to Sergio
Finish the report