In the game you can find 4 different kinds of eggs:

• Brown Egg
• White Egg
• Golden Egg
• Rotten Egg

The brown, white and golden egg can be laid by chickens as long as they are alive. The brown and white egg can be gained by killing snakes (it's random if they drop eggs, money or nothing - same counts for the color of the eggs). The rotten egg will be dropped by enemies most common in chapter 5-2 to 6-3 (you can get them in the other chapters as well but it's quite rare).

You can also ask other players (friends or randoms) if they can give them to you. The trophy will pop up when you got all in your big inventory (not the one with the 9 fields).

Note: If you ask a player for a unlimited golden egg he/she can't give it to you. It only workes when you are in the item management before you start a new chapter. Before you get the golden egg you will have to sell all your golden eggs (otherwise the unlimited golden egg turns into a normal golden egg). To multiply the golden egg put 2 in your inventory (with 9 spaces). Then sell each egg once (not twice). After that you can move one of the golden egg on the other golden egg (like if you put ammunition on a weapon to reload it). After you have done that put that egg in the big inventory and it will turn into 999x golden eggs. If you want to use the golden egg when you play the story you will have to sell it once. Otherwise you won't be able to use it.