Solved
Google Play Coconut Cannon achievement
Pirate Seas Day 22 - activate Google Play (main screen bottom right corner) before going to Adventure Mode Pirate Seas Day 22 Select Coconut Cannon as one of your plants - I like to use Tile Turnip,...
The Achievement is called "Broadside"
I had to use a Plant Food on the Coconut Cannon to take out the IMP cannon but it worked !!
