Defeating the Minerva Superboss in Crisis Core Final Fantasy VII Reunion unlocks the Divine Rule Broken trophy / achievement.
You encounter Minerva in Mission 9-6-6: The Reigning Deity. You'll do this automatically on your way to 100% Mission completion. It's the hardest boss in the game, so will likely be the last mission you finish for 100%.
Once you have all equipment pieces it's an easy fight.
Equipped Materia:
Curaga HP +999%
Drainga HP +800%
Costly Punch SPR +95
Mug VIT +40
Moogle Power VIT +60
Dualcast
Equipped Accessories:
Genji Shield
Genji Armor
Genji Glove
Ziedrich
Once the fight starts, use Mug to steal 99 Phoenix Down from Minerva (used to self-revive). Activate the Phoenix Down from the item wheel by selecting with R2/RT and pressing Circle / B on it. You must refresh this when Minerva uses her Limit Break special attack because it removes the Phoenix Down from you. As long as you always refresh Phoenix Down you can't die. Attack Minerva with Costly Punch to deal 99,999 damage each hit and heal with Curaga (thanks to Dualcast Materia you will heal twice as much).
Minerva has 10 Million Health, so takes 101 Hits with Costly Punch to defeat.
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