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