Easy PP...
	Exo Suits...
	Infinite scrap...
	Various Steam Achievements...
	Zero Exo Suit...

This method will allow you to kill approximately 1,200+ zombies every 5-8 minutes. Keep your zombie score multiplier running to get bonus PP and scrap for reaching milestones. Go to the church in south-eastern West Ridge. This area contains huge hordes of zombies. Near the steps is a military platform with an Exo Suit. Grab it, then get the Vacuum upgrade for the Exo Suit to the left of the stairs. Kill as many zombies as possible while circling the church. You can easily get 1,200+ zombie kills before the power runs out. Once the power runs out on the Exo Suit, enter the nearby van and drive it to the bridge connecting West Ridge to Old Town. This will activate a checkpoint. Once a checkpoint is activated, everything in the area will be reset. Return to the church in West Ridge and collect the Exo Suit and Vacuum upgrade again. Repeat this process as many times as desired. The level cap is 100.

To unlock the Exo Suit, progress through the main story until you leave Willamette Memorial Megaplex and reach Old Town. While in Old Town, the Exo Suit will become available. To get more Exo Suits, find the caches marked "Exo Suit" scattered throughout the game. The caches can also be in other supply crates or just lying on the ground in corners. To easily find an Exo Suit, look for large shipping containers guarded by Obscuris mercenaries since those containers usually have an Exo Suit cache in them. The battery in an Exo Suit only lasts two minutes. An Exo Suit basically allows you to easily kills zombies while being invincible and having unlimited stamina. Additionally, some interactions are only possible with an Exo Suit, which provide unconventional weapons for the Exo Suit that can be further enhanced by collecting ammunition crates for power-ups, such as guns and missiles.

While at any Emergency Shelter, go to the basement and fast travel to the Willamette Mall Emergency Shelter. Use the Employee's Only hallway to reach Caribbean Cove through the back doors that lead straight into the Pirate Ship's bottom floor entrance. In the first Pirate Ship room, loot the Treasure Chest. Treasure Chests typically give approximately 4,000 scrap. Then, pause the game and select the "Load Last Checkpoint" option. You will return to the Willamette Mall Emergency Shelter and the Treasure Chest will have respawned. Repeat this process as many times as desired. You can get approximately 40,000 scrap every 10 minutes.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
$#!&'s Getting Science	Complete Case 3 of the Story.
A Whole New World	Spend your first Skill Point.
All About the Points	Accumulate 1,000,000 points in Multiplayer Mode.
Bareknuckle Boxing	Complete an entire episode without using a weapon.
Building a New You	Spend 25 total Skill Points.
Busy Day	Complete 3 missions in a single day in Multiplayer Mode.
C-C-C-Combo!!	Get a Hit Streak over 200 then use a Skill Move.
Combat Ready	Unlock 10 Multiplayer mode-only skills.
Craftsman	Obtain all of the Multiplayer Combo Weapon Blueprints.
Door Crasher Special	Complete Case 1 of the Story.
Elementary!	Complete your first Investigation.
Eyes on the Prize	Complete Case 6 of the Story.
Faaantastic!	Take an S-Rank Photograph.
Family Photo	Take a photo of 3 players at the same time in Multiplayer Mode.
Fashionista	Try on 100 different clothing items.
Get to Work	Complete 50 Trials.
Hangry	Complete an entire episode without eating food.
Hey Big Spender	Spend 100,000 Scrap.
Hunting Grounds	Discover every Location of Interest.
Idol Worship	Find the Frank West Statue. Didn't there used to be more of these?
Innovator	Collect all Blueprints in Story Mode.
Invasion on Main Street	Complete Case 2 of the Story.
Inventor	Collect 30 Blueprints in Story Mode.
Left 100,004 Dead 2	Kill 200,008 zombies.
Like a Boss	Kill a Boss in Multiplayer Mode.
Look Who's Coming to Dinner	Complete Case 4 of the Story.
Man of the Year	Complete Case 5 of the Story.
Master Journalist	Get a Journalism Score of 100%.
Otis Would Be Proud	Fully level up the Mall Emergency Shelter.
Rookie Journalist	Solve one of the Mysteries.
Seasoned Journalist	Solve all of the Mysteries.
Skilled Athlete	Spend 20 Skill Points on Fortitude skills.
Skilled Brawler	Spend 20 Skill Points on Brawling skills.
Skilled Shooter	Spend 20 Skill Points on Shooting skills.
Skilled Survivalist	Spend 20 Skill Points on Survival skills.
Stop Hitting Yourself	Kill a zombie with a hunk of meat.
Story Completionist	Complete all Story Trials.
Survive Holiday Hell	Survive Episode 1.
Survive the Boardwalk	Survive Episode 3.
Survive the Food Court	Survive Episode 4.
Survive the Plaza	Survive Episode 2.
Tape It or Die AGAIN	Create 50 combo weapons.
Tape It or Die Fanatic	Create 58 unique Combo Weapons.
Time For Mini Golf	Complete Case 0 of the Story.
Tinkerer	Collect 5 Blueprints in Story Mode.
Vehicular Manslaughter	Create 8 unique combo vehicles.
We Are Canceling The Apocalypse	Create 5 unique Exo suit Power-Ups.
Workin' Hard	Complete all Trials.
Z-Genocider 4	The Return: Kill 53,598 zombies.
Zombie Destruction	Kill 5,000 zombies.

Successfully complete Case 6 to unlock the Zero Exo Suit in the center of the room in all Emergency Shelters. Equip the Zero Exo Suit to use it until the suit's charge is depleted. The Zero Exo Suit comes equipped with the Z-Saber (melee) and Zero Buster (ranged). The special combo shoots out a ranged Z-Saber flurry that cuts down everything in an area for several seconds. The Zero Buster can also be charged to launch an explosive plasma projectile that breaks up into several smaller explosives that bounce from the original point of impact, able to kill an entire group of zombies per shot.