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