$1 Avatar:
     Preview  the  $1  Avatar  and press R to spin him. After two full
rotations,  stop  the  spin so that you are looking at his back. Then,
press Triangle, X(2), Triangle, Circle.

Bloodrayne
     Complete all missions.

Chimaira
     In mission 29, kill a zombie near the Chimaira sign, then get the
avatar  that  it drops. The sign is located in the long street section
under the park at the top of the map.

Easy combos
     When  you  get  the  chainsaw, combos become easier. Stand over a
Manhole  and  use your chainsaw to get high combos. Manholes with lots
of  enemies  around  them  are recommended, as you can get up to a ten
combo with one slice.

Santa Claus
     Complete all missions.

Slipknot 0
     In  mission 5, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located almost in the center of Time
Square.

Slipknot 1
     In  mission 7, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located in the subway.

Slipknot 2
     In mission 10, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located by the helicopter.

Slipknot 3
     In mission 13, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located in the upper left section of
the map.

Slipknot 4
     In mission 16, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located near the landing zone.

Slipknot 5
     In mission 20, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located in Time Square.

Slipknot 6
     In mission 23, kill a zombie near the Slipknot sign, then get the
avatar that it drops. The sign is located in the bottom section of the
map.

Slipknot 7
     In mission 26, kill a zombie near the Slipknot sign, then get the
avatar  that  it  drops.  The  sign  can  be found when the mission is
started.

Slipknot 8
     In mission 31, kill a zombie near the Slipknot sign, then get the
avatar  that it drops. The sign is located in the bottom right section
of the map.