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