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