My Singing Monsters

This trophy is referring to clearing all the trees and rocks on one island. You will want to do this on Plant Island as it is the cheapest and fastest island to do it on. All the other islands will take extra gold and time to get rid of each obstacle.

Plant Island obstacles are listed below:

Small Tree: 100 gold and 20 seconds
Medium Tree: 1,000 gold and 2 hours
Big Tree: 2,500 gold and 4 hours
Small Rock: 500 gold and 10 minutes
Medium Rock: 10,000 gold and 8 hours
Big Rock: 15,000 gold and 12 hours

Once you have removed every obstacle the trophy will pop.