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.
Collected 75 specks of dust.
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.
Navigated to the buried treasure.
Grew Leonard's plant to superhuman size.
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.
Make everyone cry about their life.
Blew up the Mansion.
Visited every floor in the hotel.
Used Ransome's Itch Cream.
Collect 25 specks of dust.
Complete Franklin's Flashback.
Begin Part Three.
Read all the Thimbleweed Nickel newspapers.
Escape from the sewers.
Listen to 100 Voicemail messages.
Read 100 books in the library.
Pushed the circus mime over.
Complete Ransome's Flashback.
Complete Delores's Flashback.
Begin Part Two.
Begin Part One.