Castaway Paradise

Scattered across all three sections of the Island is just a bunch of trash. Broken TVs, old tires, empty cans etc. Pick up any 25 pieces of garbage for this trophy. There is a chance that enough trash will be available for you to get this trophy in one day but will need to unlock the Western and Northern sections to do so.

If you're fishing and reel in any garbage, it will count towards the trophy.

The trash respawns each day so if you didn't find enough the first day, there should be more than enough for you to get this trophy on the second (day). You can also just use the date/time settings method mentioned in the Roadmap to speed up time to the next day to make the trash respawn quicker.