The mail always gets through Trophy in Yoku's Island Express
The mail always gets through
Become the Post Master
How to unlock The mail always gets through
This trophy has two key prerequisites - filling every postbox (30) in the world and completing all of the deliveries (3) that you'll find unfulfilled at the Post-office. Once you've done both of these, return to the Post-office and speak with the parrot there to be awarded with the Grand Postmaster badge and earn this trophy.