Kingdom Hearts Final Mix

This trophy is for unlocking all of the gummi ship blueprints, first lets take a look at all of the gummi ship blue prints we need in this list (credit to Fubzy): LINK

A lot of blueprints are found in the middle of certain routes as well as meeting certain milestones involving Gepetto after he moves his house to Traverse Town after the events of Monstro. The main thing you want to worry about are all the Gummi Ship missions you need to complete in order to unlock the special final mix blueprints (these missions will correlate with the following trophies):

Test Pilot
Veteran Pilot
Ace Pilot

For in-depth information on completing all of the gummi missions please refer to Fubzy's Guide that I've linked to above. If you're still having trouble you can ask for personal tips at the Gummi Ship Help Thread.