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