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