To unluck this trophy, simply use your spiria gauge 50 times (
+
or any other direction)
You can either use the LVL1, 2, 3 or 4 gauge, as using a stronger Spiria doesn't add more towards the completion of the trophy.
Even though you should easily unlock this trophy during your first playthrough, progress transfers to further playthroughs (as long as you keep using the same clear data, I guess).