Skilled Trophy

For this trophy it is best to play through the first level on Braindead in single player. Go slow through each area and make sure to kill every zombie ahead of you in the level before moving ahead. If you play this during your last step you should know where all of the zombie spawns are and how many there are to kill. Finding loot isn't necessary in any way so don’t bother going out of the way to collect crates or car trunks. The only area that might cause problems is the last area before the mission endpoint, due to zombies spawning from many different places and coming from all directions at once. Be sure to use the cars with alarms and your flares and grenades to keep the zombies away from your location while you kill them.