This is the only tip I have found to get this
I picked up the 1000 hit trophy right after picking up the Claws of Hades.
After you swim a bit down the River Styx, you encounter a challenge where you need to summon a soul to finish off the enemies. Instead of doing that, equip the Claws of Hades, but abuse the L1+O attack. I admit it's a little cheap, but it works. Once you reach 1000 hits (it takes about 5-10 minutes) and unlock the trophy, summon a soul (or 12) to finish off the enemies to continue with the game.
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