OK so i gathered a bunch of proposed solutions from Playstation tropies.org. All seem good to me. I left the author's names in each post to give credit.
There are a few different places to do this, but the place I found to be the easiest was right after you find the shield of Hades in the Challenge of Atlas level. After picking up the shield, dozens of basic enemies will come out of nowhere. Using a combination of your blades and Poseidon's Rage, you should get this without too much trouble, but if you just miss it and don't have the opportunity to get it again, let the wall crush you before killing everyone and just try it again.
Comment #1 by HJROakley
Friday, September 23, 2011 @ 09:43:30 PM
I recommend waiting till right at the end of the game.
After you first fight Ares and you have to protect your family, stand by them and use Poseidon's Rage. Make sure it's maxed out and hit the CIRCLE button as many times as you can. You should get around 120 multiplier, so when it finishes just string in a couple of standard attacks to clear some space and use it a second time. You will get about 120 added to your multiplier - making about 250. I got a multiplier of around 460 using this method.
Comment #2 by Crunchward
Tuesday, September 27, 2011 @ 04:56:42 PM
I just spammed the toast out of a couple of wee fella's with the electrical magic move. Popped in no time.
Comment #3 by Gluestickid
Saturday, April 28, 2012 @ 02:44:42 AM
The easiest way by far is to do it like this:
Assuming that you've been collecting all of the collectibles until now you should have already upgraded your magic twice. Using the same spot as suggested in the main guide (After the shield of Hades) Just stand in the middle of the swarm when the gold plated enemies come down and spam Poseidon's rage. I got around 260 multiplier without trying. There you go
Comment #4 by ElektroDragon
Sunday, May 06, 2012 @ 07:07:44 PM
You can get this in Rooftops of Athens in the crossbow puzzle room when you are stuck in the lever room with 5 respawning monsters. You just need Poseidon's Rage level 2 and a full magic bar. As soon as all 5 appear, cast Rage and mash Circle. This should give you 100. Immediately after the Rage, attack to keep the counter going for about 2 or 3 seconds until wave 2 spawns. Then just repeat Poseidon's Rage with the mash again and you'll be up to 195 or maybe even 200. The first time, I was at 195, so I just attacked for a few seconds, and the Trophy popped.
This was on normal difficulty.
Comment #5 by IceVodka98
Wednesday, May 09, 2012 @ 12:54:41 PM
You can also get it when you got the Medusa Gaze magic. The 3 minotaurs will spawn infinitely if you don't kill them using the medusa gaze and you will have infinite magic too. Just spam poseidon's rage, when the magic bar runs out, use the grab move to finish off one of the minotaur, or just use normal attack, when you regain your bar, use poseidon's rage again. The trophy will pop out in a few minutes.
Comment #6 by Charlyposho
Thursday, October 04, 2012 @ 10:40:39 AM
It is true what #5 says. This is the earliest place where you can get the trophy, HOWEVER, if you try this be prepared for massive frustration. A lot of times the game won't detect you trying to grab the minotaur for the special kill. Also, if you try to attack them with normal attacks, and they block once, this will reset the counter. I spent 20 minutes here until I got it.
Comment #7 by Buttercup
Monday, December 24, 2012 @ 08:20:35 AM
I got mine by using Poseidon's rage at this point:
It was the easiest trophy I got I guess..
Comment #8 by kamijordan
Thursday, February 28, 2013 @ 03:28:07 AM
there's is a place where is very good actually, here's the place and what you should do
Comment #9 by mvratkvrt
Saturday, March 23, 2013 @ 03:22:33 AM
Best place to get those trophies (hitman, hitman 2) is against Ares. When the circle appears above Ares, just hit the button square repeatly. That's all, no big deal!
Comment #10 by Baller1492
Tuesday, June 18, 2013 @ 09:47:21 PM
I think something glitched in the game when I got this. ****SPOILER**** I was fighting the Hydra's main head (after you fight the smaller heads and pin them down with the sharp metal thing) and I died. When I came back, the heads were not pinned down and I just kept attacking one of them till I went up to 1000 hits. Good thing was is that they were just bowing their heads or something and not attacking. Weird... cool, but weird.
Comment #11 by Eternal21
Monday, September 02, 2013 @ 07:28:21 PM
Using dairy costume, simply spam Poseidon's Rage on the 3rd hydra head, when it asks you to execute the final QTE.