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.
Complete the boss fight without taking damage.
Break into the vault at Raccoon HQ.
Fly through the donut hole.
Find Trash King's secret getaway vehicle.
Complete the Trashopedia.
Bring everyone back from underground.
Win the boss fight.
Destroy Trash King's monument.
Lose the boss fight.
Destroy Trash King's monitor.
Hack into the mainframe.
Destroy the donut shop.
Destroy Raccoon Lagoon.
Make Chef's secret soup recipe.
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.