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.
Make everyone cry about their life.
Grew Leonard's plant to superhuman size.
Read 100 books in the library.
Listen to 100 Voicemail messages.
Pushed the circus mime over.
Got Ransome's bad ending.
Stayed for all the credits.
Complete the game in hard mode.
Read all the Thimbleweed Nickel newspapers.
Part Nine: The Deleting.
Part Eight: The Escape.
Collected 75 specks of dust.
Part Seven: The Madness.
Part Six: The Factory.
Begin Part Five.
Get an alive character into the Hotel penthouse.
Used Ransome's Itch Cream.
Begin Part Four.
Catch the killer.
Blew up the Mansion.
Collect 50 specks of dust.
Navigated to the buried treasure.
Collect 25 specks of dust.
Visited every floor in the hotel.
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.