Found the treasure chest suggested in walk through but it won't open. Am I looking in wrong place? I'm on Fun Island.

This is just a rip off of Hidden Folks. Please buy Hidden Folks instead. https://store.steampowered.com/app/435400/Hidden_Folks/

Hi, A friend and me both beaten the game. Both problems below happened to use individual. First after we beaten the circus, we didn't get that achievement but going back to that level did help with unlocking it. The achievement for the last level doesn't unlock either, and I've tried so many things, and nothing seems to unlock it. I've gone back to that level, I've seen the credits, started other levels. Nothing helped. Please fix the last achievement....

suggestions are welcome

I have found every item on the Fun Island level including legend and neither achievement unlocks. I am able to move onto the next level but when I return to the Fun Island level all my progress has disappeared. I have completed the level 3 times and my progress has never saved. I have uninstalled and installed the game again and that still hasn't fixed the issue. I have actually completed the game but I can't unlock 3 achievements because my game is bugged and does recognize I have fully completed the ...