Here is the full list of all 11 Beacon Pines achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Find a Charm
Solve a Riddle
Watermelon Bongo
Poke around the library
The Big Chill
Out with a Bang
Catch all the "fish"
Close the Book
Find a way to kick a melon
Born in a Barn