Here is the full list of all 20 Donut County achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Destroy Trash King's monument.
Complete the boss fight without taking damage.
Lose the boss fight.
Find Trash King's secret getaway vehicle.
Fly through the donut hole.
Break into the vault at Raccoon HQ.
Make Chef's secret soup recipe.
Complete the Trashopedia.
Bring everyone back from underground.
Win the boss fight.
Destroy Trash King's monitor.
Hack into the mainframe.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Break 3 dozen eggs.
Stock up on gamer fuel.
Finish Gecko Park without collecting the radio.
Quack 100 times.
Set Pepper's trailer on fire.
Release the hot air balloon.