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.
Bring everyone back from underground.
Win the boss fight.
Destroy Trash King's monument.
Destroy Trash King's monitor.
Hack into the mainframe.
Quack 100 times.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Stock up on gamer fuel.
Release the hot air balloon.
Complete the Trashopedia.
Set Pepper's trailer on fire.
Break 3 dozen eggs.
Finish Gecko Park without collecting the radio.
Complete the boss fight without taking damage.
Lose the boss fight.
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.