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