Here's what you need to know about the platinum: no excessive grinding needed, but you'll want to focus on specific milestones. Complete the main areas through spring meadows, flying waters, and ancient sanctuary while taking down the paintress and both axon bosses. The skill challenges are straightforward, just focus on clean boss fights without damage and unlock esquie's abilities along the way.

For actual requirements, upgrade any weapon to its maximum level and make sure to assign lumina points as you progress. Character progression trophies will come naturally through normal gameplay, and you don't need to reach level 99. Combat mastery does matter though - practice your overcharge timing with gustave, and work on chaining 10 or more actions without breaking flow.

Tip: everything can be cleaned up using chapter select, so don't stress about missing anything on your first run. Just play naturally and focus on mastering the core mechanics, especially those perfect dodge timings and combat flows.