Here is just a bit more content:
**WARNING- ACHIEVEMENT INFORMATION** Zombie Hunter - 20 points.
TYPE: 1 Play REQ: Defeat at least 1,000 zombies.
Zombie Killer - 20 points.
TYPE: 1 Play REQ: Defeat at least 10,000 zombies.
Zombie Genocider - 20 points.
TYPE: 1 Play REQ: Defeat at least 53,594 zombies.
Self Defense - 20 points.
TYPE: 1 Play REQ: Defeat at least 1 psychopath.
Peace Keeper - 20 points.
TYPE: 1 Play REQ: Defeat at least 5 psychopaths.
Punisher - 20 points.
TYPE: 1 Play REQ: Defeat at least 10 psychopaths.
Legendary Soldier- 20 points.
TYPE: 1 Play REQ:
?
Hella Copter - 20 points.
TYPE: 1 Play REQ:
?
Tour Guide- 20 points.
TYPE: 1 Play REQ: Escort 8 survivors at once.
Frank the Pimp - 20 points.
TYPE: 1 Play REQ: Simultaneously escort 8 female survivors.
Full Set - 20 points.
TYPE: Total REQ: Collect all portraits in the NOTEBOOK.
Humanist - 20 points.
TYPE: 1 Play REQ: Get at least 10 survivors out of the mall.
Life Saver- 20 points.
TYPE: 1 Play REQ: Get at least 20 survivors out of the mall.
Saint - 20 points.
TYPE: 1 Play REQ: Get at least 50 survivors out of the mall.
Strike!- 20 points.
TYPE: 1 Play REQ: Send at least 10 zombies flying with bowling balls.
Costume Party - 20 points.
TYPE: 1 Play REQ: Place novelty masks on at least 10 zombies.
Raining Zombies - 20 points.
TYPE: 1 Play REQ: Knock at least 30 zombies aside with a parasol.
Gourmet - 20 points.
TYPE: 1 Play REQ: Eat all types of food available in the mall.
Item Smasher - 20 points.
TYPE: Total REQ: Break at least 100 items.
Bullet Point - 20 points.
TYPE: 1 Play REQ: Fire at least 1,000 bullets.
Perfect Gunner - 20 points.
TYPE: 1 Play REQ: Don't miss with a machine gun.
Photojournalist - 20 points.
TYPE: 1 Play REQ: Score at least 1,500 PP from a single photo.
The Artiste - 20 points.
TYPE: 1 Play REQ: Score at least 3,000 PP from a single photo.
Group Photo - 20 points.
TYPE: 1 Play REQ: Get 50 Target Markers with the camera.
Portraiture - 20 points.
TYPE: 1 Play REQ: Photograph at least 10 survivors.
Census Taker - 20 points.
TYPE: 1 Play REQ: Photograph at least 50 survivors.
Psycho Photo - 20 points.
TYPE: 1 Play REQ: Photograph at least 4 psychopaths.
Psycho Collector - 20 points.
TYPE: 1 Play REQ: Photograph at least 10 psychopaths.
PP Collector - 20 points.
TYPE: 1 Play REQ: Photograph all PP Stickers.
Snuff Shot B - 20 points.
TYPE: 1 Play REQ:
?
Snuff Shot J - 20 points.
TYPE: 1 Play REQ:
?
Transmissionary - 20 points.
TYPE: 1 Play REQ: Answer all calls from Otis.
Indoorsman - 20 points.
TYPE: 1 Play REQ: Spend at least 24 hours indoors.
Outdoorsman - 20 points.
TYPE: 1 Play REQ: Spend at least 24 hours outdoors.
Freefall - 20 points.
TYPE: 1 Play REQ: Drop from a height of at least 16 feet (5 meters).
Marathon Runner - 20 points.
TYPE: Total REQ: Cover a distance of 26.2 miles (42.195 km).
Carjacker- 20 points.
TYPE: 1 Play REQ: Steal the convicts' vehicle.
Stunt Driver - 20 points.
TYPE: 1 Play REQ: Jump a car at least 33 feet (10 meters).
Stunt Rider - 20 points.
TYPE: 1 Play REQ: Jump a motorcycle at least 33 feet (10 meters).
Zombie Road- 20 points.
TYPE: 1 Play REQ: Walk over 33 feet (10 meters) on the backs of zombies using the Zombie Ride.
Karate Champ - 20 points.
TYPE: 1 Play REQ: Defeat at least 1,000 zombies barehanded.
Sharp Dresser - 20 points.
TYPE: Total REQ: Change into at least 20 different costumes.
Clothes Horse - 20 points.
TYPE: Total REQ: Change into all costumes available in the mall.
Level Max - 20 points.
TYPE: Total REQ: Reach Lv. 50.
Unbreakable - 20 points.
TYPE: 1 Play REQ: Get the ture ending without being knocked out.
Overtime Mode- 20 points.
TYPE: 1 Play REQ: Unveil all CASES and be at the heliport at noon.
? Mode - 20 points.
TYPE: 1 Play REQ: Get the true ending.
3 Day Survivor - 20 points.
TYPE: 1 Play REQ: Survive for at least 72 hours.
5 Day Survivor- 20 points.
TYPE: 1 Play REQ: Survive for at least 5 days.
7 Day Survivor - 20 points.
TYPE: 1 Play REQ: Survive for at least 7 days.
I just finished Genocider last night and, wow, was it hard. I did it the hard way, but I did get it done. That got me thinking that there had to be a better way so I did some digging. If you are having problems getting this achievement here is a nice map I found on some random site that can give you a little guidance. Just make sure you are going in well prepared, good weapons and lots of health stuff.