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.
Hack into the mainframe.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Stock up on gamer fuel.
Set Pepper's trailer on fire.
Quack 100 times.
Release the hot air balloon.
Complete the Trashopedia.
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.