Here is the full list of all 33 Thimbleweed Park achievements.
Begin Part Four.
Catch the killer.
Collect 25 specks of dust.
Complete Franklin's Flashback.
Begin Part Three.
Escape from the sewers.
Complete Delores's Flashback.
Complete Ransome's Flashback.
Pushed the circus mime over.
Begin Part Two.
Begin Part One.
Get an alive character into the Hotel penthouse.
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.
Read 100 books in the library.
Read all the Thimbleweed Nickel newspapers.
Visited every floor in the hotel.
Used Ransome's Itch Cream.
Blew up the Mansion.
Collect 50 specks of dust.
Listen to 100 Voicemail messages.
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.