Please see Greatest Hits Trophy for more information.
Pro Tip: Easy to get at the puppy mill, which is right after breaking the statue of Athena. I just spammed L1+Square and got it in about 1 minute. I don't recommend going for the 1000-hit trophy at this location though. You will get interrupted every 300+ hits or so and get frustrated!
All credit goes to orginal authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides.
http://www.playstationtrophies.org/game/god-of-war-ghost-of-...