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