The Beast Trophy
Kill 6,666 people in Campaign
As it states, you will have to reach a total of 6,666 enemies killed in campaign. Do not be alarmed though, as after you complete the game you can use chapter select to complete any level of your choice and add to the number of killed enemies. The best place to farm kills for this trophy is the crane section of chapter 2 (Thanks to billgolden78 for the tip). All types of kills count towards this trophy. It will take 5-7 playthroughs in total ( if you choose to play through the entire game instead of farming kills). It does involve a bit of grinding but those who enjoy the game will find it to be quite easy.