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