Andy's Surfing Costume - Receive a Grade (any grade) on Every Level on Child's Play Difficulty
Carrie's Ninja Costume - Obtain all Level 3 Weapons for Carrie
Carrie's Valley Girl Costume - Receive any grade on every level on Horror Difficulty
Jennifer's Nurse Costume - Upgrade all of Jennifer's Weapons to Level 3.
Zack's Deathgame Costume - Receive any grade on every level on Thriller Difficulty
Complete each achievement to get the allotted gamerscore. The numbers between the () are the amount of points your recieve for each achievement.
"It's Mine! ALL MINE!" (25) - Collect 10,000 Monster Tokens across all characters.
A Hard Day's Rockin' (25) - Play at least 24 hours of the single player adventure.
A Little Help Goes A Long Way (20) - Grab some buddies and see how many waves you can wade through in the Co-op Dojo!
Accessorize to the MAX! (10) - Carried all secondary items at once.
Archaeologist (45) - Collect 72 Specialty Melee Weapons!
Are You Crazy?! (10) - Frag 4 players in under half a second in any ranked match!
Are You Related To A Belmont? (20) - Don't just hide. Fight back! Score 30 monster stuns in a single ranked monster hunter match!
Block Party! (25) - Completed Chapter 1 Suburbia Nightmare
Control Freak (20) - Perform all flag captures in a ranked CTF match!
Demolitions Expert (20) - Score all frags using only grenades in a single FFA Deathmatch game!
Did Someone Order Chinese? (15) - Find a way to deal with that pesky Granny evil cat shield! (on Thriller or higher)
Dirty Deeds (10) - Score 10 frags by summoning homing explosive zombies while in zombie form in a single ranked match!
Does Anyone Clean This Roof? (15) - Collect all weapon parts on Hell School Rooftops. (on Thriller or higher)
Exhumed (15) - Smash all the gravestones in the hidden graveyard and survive the horror! (on Thriller or higher)
Fashion Show (70) - Unlock every character costume.
Go, Speed Boater, GO! (15) - Zeppelin Flyer X and The Leprechaun has challenged you to beat his record! (Thriller or higher)
Graveyards Creep Me Out Too... (25) - Completed Chapter 4 Cemetery Scary
Grumpy Old Man (15) - He's old and grumpy, so try to show him you care by not letting him get hurt. (Thriller or higher)
Hard Day's Rockin' (25) - Play at least 24 hours of the single player adventure.
Have Fun Cleaning The Grill! (10) - Take road rage to the extreme and frag 20 players while driving a vehicle!
Have Fun Stormin' The Castle! (25) - Complete Chapter 5 Evil Castle.
High School Flag Team Captain (20) - Become a flag capping beast by using the flag to kill 4 players in a single ranked CTF match!
Homemade Weapon Club Card Holder (10) - Attained all Level 1 Weapons
Homemade Weapon Club Chairman (20) - Attained all Level 2 weapons.
Homemade Weapon Club Founder (30) - Attained all Level 3 weapons.
Honed Survival Instincts (10) - See if you can get far enough going solo in the Co-op Dojo!
I Said Turn Off Your Car Alarm! (15) - Destroy all those pesky, loud cars in the Parking Lot with your mech! (on Thriller or higher)
I Think We're Being Followed... (15) - Bring out the white knuckled driver in you and blast through the escape! (Thriller or higher)
JAILBREAK! (15) - There has to be something useful in the castle jailcells... right? (Thriller or higher)
Junkyards Just Aren't The Same (15) - Make a mad dash to Bob Zombie! (on Thriller or higher)
Killing Machine! (20) - Get 50% of the total kills in a ranked FFA Deathmatch game!
Leading Noobs To The Slaughter (20) - Destroy the opposing team by having your team win with 100% of the kills in a ranked Team Deathmatch
Long, Hard Road Out Of Suburbia (20) - Travel 1,000 kilometers
Maniac! (30) - Kill 10,000 monsters.
Master Of Your Domain (20) - Enter and never leave the hill in a ranked King of the Hill match!
Monster Survival Guide Pays Off! (10) - Try to win a 10 minute or longer ranked Monster Hunter game without being turned in a monster!
Monsterologist (20) - Unlock every Bestiary entry.
Nice Guys Finish Last (20) - Become a saint and win a ranked friendly fire token race match without killing any other players!
Prowler On The Roof (15) - Collect all weapon parts in Streets of Suburbia. (on Thriller or higher)
School's Out Foreva! (25) - Completed Chapter 3 Hell School.
Shop 'Til You Drop (25) - Completed Chapter 2 Shopping Maul.
The Bodyguard (15) - These gold zombies trust you with their life. Show them you mean business. (on Thriller or higher)
They Wouldn't Spend It Properly (15) - Let the monsters know that you're looking after their best gold interests. (Thriller or higher)
Trap Assassin (15) - In Zack's House, use your cunning to defeat all of the enemies with traps! (on Thriller or higher)
Very Sneaky, Sir (15) - Show them you're a ninja of the night when taking back what's rightfully yours. (Thriller or higher)
We Don't Need No Stinkin' Ammo! (15) - Resupplying is for the weak! Beat the final showdown without buying more ammo! (Thriller or higher)
What's That Sound? (15) - Why waste ammo when a massive, angry ball of death will do the work for you? (Thriller or higher)
When Household Appliances Attack (15) - Show the monster masses that vacuuming can be fun... by using excessive force! (Thriller or higher)
You Got Fur In The Hyperishdrive (15) - Can you escape the garbage trucks of death without boosting? (on Thriller or higher)
Your Kung Fu Is Strong (20) - Defeat all challengers using only your melee weapon in a ranked FFA Deathmatch!
At the pause screen press:
Up, Up, Down, Down, Left, Right, Left, Right, B, A.
The typing console will appear then type in the cheat:
patrickdugan - Animal Sounds
ihatefunkycameras - Disable special tracking cameras
upthejoltcola - Faster Music
MorgyTheMole - First Person/Headless
ArieannDeFazioWithFlair - Increase the Size of Jennifer's Chest
stevebrooks - Infinite Secondary Items
SouthPeak - Push Objects Away from Player
reverb - Remove Film Grain
chipmunks - Squeaky Voices