Saint Seiya: Soldiers' Soul

A challenge is an in match condition that must be fulfilled before the battle ends. An example of some challenges you'll see during Legend of Cosmo mode include: "Guard against your opponent's attacks at least X times", "Win with at least X% of your HP gauge left", etc. What makes this trophy easy is that you don't have to obtain all of the challenges in one attempt. You can complete one challenge during an episode, come back to that same Episode Battle in Episode Select and have the challenge that you completed still complete. This allows you to focus on challenges one at a time, which is preferable in some episodes.

Once you've completed 50% of all the challenges in Legend of Cosmo mode, the trophy will unlock.