The earlier you can get this trophy is in the Temple Of Helios, when going to the left of the save point (temple of helios save point) there will be 8 or 9 satyr's that will spawn, kill 7(just to make sure to not kill'em all) and let the last one kill you, rinse and repeat and you will get your trophy.
I almost forgot to mention that they wont have the circle prompt over their heads, when you think they have enough damage try to grab them and you will be able to do the mini-game to slit their throats.