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.
Lose the boss fight.
Break into the vault at Raccoon HQ.
Complete the Trashopedia.
Find Trash King's secret getaway vehicle.
Fly through the donut hole.
Bring everyone back from underground.
Win the boss fight.
Complete the boss fight without taking damage.
Destroy Trash King's monitor.
Hack into the mainframe.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Make Chef's secret soup recipe.
Break 3 dozen eggs.
Stock up on gamer fuel.
Quack 100 times.
Finish Gecko Park without collecting the radio.
Set Pepper's trailer on fire.
Release the hot air balloon.