This is an easy achievement but it can be pricey if you don't have appropriate characters. In order to get this achievement, you have to click on the magnifying glass symbol which can be found in some areas' menus. Keep in mind: The higher ability of sense which your characters have, the faster and cheaper investigation you can do.
Some of the areas that you can investigate:
- Tower of Brass (5 clues required)
- Spawn Point Village (8 clues required)
- Airship Docks (8 clues required)
- Nameless Bridge (9 clues required)
- Big Town (9 clues required)
- Polyhedron Islands (9 clues required)
- Meadows (10 clues required)
- Vault (11 clues required)
- The Wall (14 clues required)
- Zeroth Point (14 clues required)
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Note: You may not see all of the areas beacuse of your progress in the game.