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