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.
Got Ransome's bad ending.
Read 100 books in the library.
Collected 75 specks of dust.
Grew Leonard's plant to superhuman size.
Make everyone cry about their life.
Listen to 100 Voicemail messages.
Navigated to the buried treasure.
Stayed for all the credits.
Complete the game in hard 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.
Begin Part Four.
Catch the killer.
Visited every floor in the hotel.
Read all the Thimbleweed Nickel newspapers.
Collect 50 specks of dust.
Blew up the Mansion.
Collect 25 specks of dust.
Used Ransome's Itch Cream.
Complete Franklin's Flashback.
Begin Part Three.
Complete Delores's Flashback.
Escape from the sewers.
Complete Ransome's Flashback.
Pushed the circus mime over.
Begin Part Two.
Begin Part One.