Bronze Star Trophy in White Knight Chronicles

There are 8 skills to learn in White Knight Chronicles. You can master any of them. You need to master 1 of them to get this trophy. Mastering the skill means that you have unlocked every ability within that skill tree. While this is not the most effective way to learn for later development, it is needed for this trophy. Just pick the skill you're happiest with and aim to master that. You need to spend approximately 90 skill points on 1 skill to master it. You can only get this trophy with your Avatar.