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