Here is the full list of all 19 Highway Blossoms achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Completed Highway Blossoms on Extreme difficulty
Turned on Goofball Mode
Set the character speed below 10 characters per second
Checked out the guest art section. Now all it needs is a glass case.
Turned on skip mode for all messages
Checked out the credits on your own time
Finished the epilogue
Finished the story
Unlocked every journal entry
Got lucky at blackjack
Now you're back on track
Let's hope you don't ever again
Didn't find the second piece of treasure
Found the first piece of treasure
Tried out the hi-contrast textbox. Who knows, you might like it!
Got a copy of the miner's journal
Started a new game
You know what you did