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