When you have beaten the game and unlocked overtime mode and got the 5-Day Survivor Achievement the laser sword will spawn in the security room along with your wrestling boots and Megaman outfit.

At Al Fresca Plaza in the Flex's Gym break each punch bag along the back wall for 2,000 PP each and then 10,000 PP for breaking them ALL.

Get the following achievements in 72 Hours mode to unlock the corresponding ending

Unlock Ending A:
Solve ALL the cases and return to the Heliport at 12am on the 22nd

Unlock Ending B:
Solve ALL the cases and rescue a certain amount of survivors

Unlock Ending C:
Don't get to the Heliport on time and solve ALL the cases

Unlock Ending D:
At 12am on the 22nd be a prisoner of the Special Forces

Unlock Ending E:
Don't be at the Heliport and don't solve ALL the cases

Unlock Ending F:
Fail to collect ALL of Carlitos bombs on act 7-2

Complete the following tasks to unlock the corresponding playing mode

Unlock Infinity Mode:
Obtain the 'True Ending'

Unlock Overtime Mode:
Complete the first 72 hours of Frank's stay in the mall and then return to the helipad by noon on the 22nd

Complete each of the following tasks to unlock 20 Gamerscore Points

Strike!:
Using bowling balls send at least 10 Zombies flying

Costume Party:
Place novelty masks on at least 10 Zombies

Raining Zombies:
Using a parasol knock at least 30 Zombies aside

Karate Champ:
Defeat at least 1,000 Zombies barehanded

Zombie Hunter:
Defeat at least 1,000 Zombies

Zombie Killer:
Defeat at least 10,000 Zombies

Zombie Genocider:
Defeat at least 53,594 Zombies

Self Defense:
Defeat at least 1 psychopath

Psycho Photo:
Photograph at least 4 psychopaths

Peace Keeper:
Defeat at least 5 psychopaths

Psycho Collector:
Photograph at least 10 psychopaths

Punisher:
Defeat at least 10 psychopaths

Tour Guide:
Escort 8 survivors at once

Frank the Pimp:
Simultaneously escort 8 female survivors

Full Set:
Collect ALL portraits in the notebook

Portraiture:
Photograph at least 10 survivors

Humanist:
Rescue at least 10 survivors out of the mall

Life Saver:
Rescue at least 20 survivors out of the mall

Saint:
Rescue at least 50 survivors out of the mall

Census Taker:
Photograph at least 50 survivors

Gourmet:
Eat all types of food available in the mall

Item Smasher:
Break at least 100 items

Bullet Point:
Fire at least 1,000 bullets

Perfect Gunner:
Don't miss with a machine gun

Photojournalist:
Score at least 1,500 PP from a single photo

The Artiste:
Score at least 3,000 PP from a single photo

Group Photo:
Get 50 Target Markers with the camera

PP Collector:
Photograph all PP Stickers

Transmissionary:
Answer ALL calls from Otis

Indoorsman:
Spend at least 24 hours indoors

Outdoorsman:
Spend at least 24 hours outdoors

Marathon Runner:
Cover a distance of 26.2 miles - 42.195 KM

3 Day Survivor:
Survive for at least 72 hours

5 Day Survivor:
Survive for at least 5 days

7 Day Survivor:
Survive for at least 7 days

Carjacker:
Steal the convicts' vehicle

Freefall:
Drop from a height of at least 16 feet - 5 Meters

Stunt Driver:
Jump a car at least 33 feet - 10 Meters

Stunt Rider:
Jump a motorcycle at least 33 feet - 10 Meters

Zombie Road:
On the backs of Zombies using the Zombie Ride walk over 33 feet - 10 Meters

Sharp Dresser:
Change into at least 20 different costumes

Clothes Horse:
Change into ALL costumes available in the mall

Unbreakable:
Get the true ending without being knocked out

Overtime Mode:
Unveil ALL cases and be at the heliport at noon

8 Mode:
Get the true ending

Level Max:
Reach level 50