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