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.
Blew up the Mansion.
Navigated to the buried treasure.
Collected 75 specks of dust.
Part Seven: The Madness.
Part Six: The Factory.
Begin Part Five.
Get an alive character into the Hotel penthouse.
Visited every floor in the hotel.
Begin Part Four.
Catch the killer.
Collect 50 specks of dust.
Used Ransome's Itch Cream.
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.
Read 100 books in the library.
Read all the Thimbleweed Nickel newspapers.
Listen to 100 Voicemail messages.
Make everyone cry about their life.
Grew Leonard's plant to superhuman size.
Got Ransome's bad ending.
Didn't pick up any specks of dust.