Here is the full list of all 33 Thimbleweed Park achievements.
Got Ransome's bad ending.
Complete the game in hard mode.
Grew Leonard's plant to superhuman size.
Collected 75 specks of dust.
Visited every floor in the hotel.
Complete the game in casual mode.
Stayed for all the credits.
Part Nine: The Deleting.
Collect 50 specks of dust.
Blew up the Mansion.
Part Eight: The Escape.
Part Seven: The Madness.
Begin Part Five.
Part Six: The Factory.
Get an alive character into the Hotel penthouse.
Begin Part Four.
Catch the killer.
Make everyone cry about their life.
Used Ransome's Itch Cream.
Collect 25 specks of dust.
Complete Franklin's Flashback.
Begin Part Three.
Read all the Thimbleweed Nickel newspapers.
Escape from the sewers.
Complete Delores's Flashback.
Complete Ransome's Flashback.
Pushed the circus mime over.
Begin Part Two.
Begin Part One.
Read 100 books in the library.
Listen to 100 Voicemail messages.
Navigated to the buried treasure.
Didn't pick up any specks of dust.