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