This should be done on the first island.
Create a camp and don't put any coins in archers.
You can put coins to grow the camp but keep in mind you cannot attack any greed or kill any animal (rabbit or deers)
So basically you have to hang around until the achievement pops up, without attacking anything at all. You can go gather the chests with coins, that will help increase your income. Also the merchant will provide coins every day (don't forget to keep at least one coin to dispatch him and comes again on the next night).
Wander around until it pops up. I was able to get it when the moon started going up in the sky on the fourth day.