Here is the full list of all 33 Thimbleweed Park achievements.
Complete the game in casual mode.
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.
Collect 25 specks of dust.
Begin Part Four.
Catch the killer.
Complete Franklin's Flashback.
Begin Part Three.
Complete Delores's Flashback.
Escape from the sewers.
Complete Ransome's Flashback.
Begin Part Two.
Begin Part One.
Complete the game in hard mode.
Stayed for all the credits.
Pushed the circus mime over.
Read 100 books in the library.
Read all the Thimbleweed Nickel newspapers.
Visited every floor in the hotel.
Used Ransome's Itch Cream.
Blew up the Mansion.
Collect 50 specks of dust.
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.
Got Ransome's bad ending.
Didn't pick up any specks of dust.