Hi Dextter, welcome to the forums,
I’m sorry for my delay in getting to your comment and to hear you’re having trouble unlocking this achievement.
Please confirm for me the following:
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Are you playing version 2116? (this number is in the bottom left of the main menu)
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Are you attempting this trophy on a game-generated island, or one you added yourself via the cartographer? If this is a custom added island, please note that the “Gone Green” trophy, which I believe is what you’re describing, cannot be unlocked on a custom island. There are a few trophies with restrictions around island type which you can find a list of here: A Note on Console Achievements / Trophies
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Are you playing Multiplayer or Single Player when attempting to get this trophy? If multiplayer, are you the host or Player 2?
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Have you double checked the Trophy list on your console outside the game? Incase the notification failed to show for you.
Any additional information you can provide about your save as well as your setup in game when attempting to unlock this trophy would be greatly appreciated and may help the team investigate any potential issues blocking the achievement or I may be able to provide some suggestions of things to try.
Thank you.