Here is the full list of all 33 Thimbleweed Park achievements.
Part Eight: The Escape.
Part Nine: The Deleting.
Complete the game in hard mode.
Stayed for all the credits.
Part Seven: The Madness.
Collected 75 specks of dust.
Part Six: The Factory.
Begin Part Five.
Get an alive character into the Hotel penthouse.
Begin Part Four.
Catch the killer.
Collect 50 specks of dust.
Collect 25 specks of dust.
Navigated to the buried treasure.
Used Ransome's Itch Cream.
Complete Franklin's Flashback.
Visited every floor in the hotel.
Begin Part Three.
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.
Escape from the sewers.
Read 100 books in the library.
Read all the Thimbleweed Nickel newspapers.
Blew up the Mansion.
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.