Here is the full list of all 39 Pentagonal Saloon achievements.
Free the ghost
Catch your candies
Eat your chocolate
Eat your lollipop
Let the sugars flaw
Locate the goblet
Solve the goblet puzzle
Get all confirmations from the screens
Collect the square card
Solve the geometrical puzzles
Open the geometrical doors
Collect a note
Solve the puzzle at room-4
Collect the circle card
Make all playing-cards visible
Collect the triangle card
Get bitten by spider
Solve the puzzle
Fece the fist
Solve the puzzle at room-3
Get the flamethrower
Collect your sugars
Get wet
Collect a coin
Solve the light games