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