Press [Ctrl] + [Shift] + [F5] to enter Developers mode.
Get a 3-star rank in all available dishes using the these recipes .
Purchase all the tables for your small restaurant then make deals with enough people so it becomes full. When the restaurant is full, you will not be able to start a trading dialogue with the next customer in line.
The Golden Scythe is obtained during the storyline. After the professor appears and you have lured a zombie onto the treadmill, you will be given the Golden Scythe to cut the grass that is growing on the graveyard.
Go to the island where you met a friendly cow after you built a bridge. Dig around to the left of the path that runs over the bridge on that island.
Go to the small graveyard in the forest and dig in front of the crypt and tombstones.
Allow any customer to have their food order for free by not take anything from them.
Repeatedly decline customers while trading by telling them to starve to death, because they have nothing to pay you with.
Repeatedly fight the forest zombies until the achievement is earned.
Carry a golden chicken across a road on the way to the chicken coop.