I have collected seeds and the pickaxe in Greece, side quest - Trip around the world and it does not count allowing me to finish this side quest
pixel_player89377585
Try a restart for a start.
Then check with the maps
https://drive.google.com/drive/mobile/folders/12HdZ3pvl6Nd3XweSH8IXftOnEnocbFyY?usp=drive_open
and visit the spots again to check if you indeed picked all up.
What does your quest and inventory say? Screenshots?
