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