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.
Destroy Trash King's monitor.
Hack into the mainframe.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Stock up on gamer fuel.
Quack 100 times.
Release the hot air balloon.
Win the boss fight.
Bring everyone back from underground.
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.
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.