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