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