Here is the full list of all 37 Demetrios - there are The BIG Cynical Adventure achievements.
Forget to close the faucet before leaving Paris
Sandra insults her parents in her postcard
Finish the game
Experience all of the Game Overs
Create a clone of Bjorn and Caroline
Insult the statue in the last room
Order Sandra to lick the statue
Get all the game cookies
Decide not to commit suicide after being poisoned
Finish Chapter 5
Win 10,000 points on the pinball tombstone
Get rid of Caroline
Finish Chapter 4
Sandra write insults about the hotel
Fall from the roof accidentally
Experience half of the Game Overs
Put the entire plant in the sorcerer's glass
Spill all the water in the container at the museum
Finish Chapter 3
Try disturbing things on Henri
Refuse to help Henri
Finish Chapter 2
Get all funfair items
Win 1,000 coins at the funfair
Win the Horse Race trophy
Win the Worm Race trophy
Win 100 coins at the funfair
Win the Pet Shoot trophy
Win the Plate Shoot trophy
Turn the wheel and die
Win all the plushes at the funfair claw machines
Get half of the game cookies
Die 10 times
Finish Chapter 1
Eat 3 rotten things on the floor
Use at least 10 cookies
Do dirty things at the police station