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