Here is the full list of all 16 Greyfox RPG achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Get the bad ending.
Kill everyone.
Knock down and eat a coconut.
Commit two acts of theft.
Get the so-so ending.
Save all of Katharine's cat.
Finish the game.
Get the good ending.
Don't kill anybody.
Complete Katharine's storyline.
Have Esmeralda arrested.
Complete Mabel's storyline.
Have tea bags dumped on you.
Complete Mr. Brown's storyline.
Complete the nurse's storyline.
Clean up all the dog poop.