Dark Cloud 2
31 Achievements
80-100h
A True Visionary
Invent every possible object.
1.2%
How to unlock the A True Visionary achievement in Dark Cloud 2 - Definitive Guide
This cannot be completed until Chapter 8 when you get the last needed photograph.
Missable
There are 128 things to invent in the game. You don't need to actually make them, just come up with them from the idea seeds. You can use this web app made by Reddit user u/tedmeat. There is a checklist for all of the inventions along with what you need to make them. To get all of the inventions, you will need to have certain missable scoops and ideas. See Take a Picture, It Will Last Longer for the missables used in inventions.
If you have missed something you need, don't worry. In Max's house, go to the bedroom (the door on the stairs). You will see a book on a desk. This is the Photo Album, and it is used to share photos between save files. If you've missed an idea/scoop, you can start a new game, get what you're missing, transfer it over, and use it. This works best with early ones, as they can be obtained fairly quickly.
Upon inventing the final item, you will unlock this trophy.
You won't be able to invent everything until after beating Flotsam in Zelmite Mine.