Jumping Tip
A good tip is too go to a wall on a mission and the horde comes jump and keep on jumping until your in the horde and get a machine gun and just shoot all around till they are dead. If it dose not help I am sorry.
Skip the lift
In the level of mercy hospital where you go in the lift and it calls a horde instead go all the way to the left of the lift and there will be a garage door a different size keep hitting it (note it will take a bit be patient) it will break leading you into the next area allowing you to skip the lift.
How Set Off A Car Alarm As Infected
As A Smoker, Hide Behind The Car And When The Survivors Are Close Enough, Try To Pull Them Into Car, If You Do It Right The Alarm Will Go Off. Usually They Won't Shoot You Until The Alarm Is Activated. If It's Not They Probably Won't Shoot You.
Unlockable Rocket Launcher
Complete the game on any difficulty to unlock the Rocket Launcher. It should appear at the beginning and middle of every level.
Glitch - Lots of ammo at start blood harvest
when you start playing blood harvest, take either the shotgun or the other one, then kill yourselve falling down a rock that is near there, it will restart the level and you will have or either 8 bullets more if its the shotgun or you will have 50 bullets more if you chose the other weapon, keep doing it until you want ( if you chose this weapon that louis uses on the introductiion, dont over do it while you have a lilttle bit more than 1000 or else it will return back and you will have less than 50 ammo). please keep in mind that this worked for me on 2 player non connection
Achievements
| Unlockable | How to Unlock |
|---|---|
| 101 Cremations (20) | Set 101 Infected on fire. |
| Akimbo Assassin (30) | Survive an entire campaign using only pistols. |
| All 4 Dead (30) | Kill all four Survivors in one life while playing as a Tank. |
| Back 2 Help (20) | Leave a safe room to save an incapped teammate and bring them back safely. |
| Barf Bagged (20) | Cover four Survivors with Boomer bile at once. |
| Big Drag (20) | Drag a Survivor 100 feet with your tongue. |
| Blind Luck (20) | You or another Survivor take no damage after being vomited on by a Boomer. |
| Brain Salad (15) | Make 100 headshot kills. |
| Burn the Witch (10) | Light a Witch with a Molotov. |
| Chain Smoker (20) | Constrict two Survivors in one life as a Smoker. |
| Clean Kill (10) | Shove a Boomer and then kill him without him splashing on anyone. |
| Cr0wnd (30) | Kill a Witch with a single headshot. |
| Dead Baron (15) | Survive the Dead Air campaign. |
| Dead Giveaway (10) | Heal a fellow Survivor when your own health is below 10. |
| Dead Stop (10) | Punch a Hunter as he is pouncing. |
| Dead Wreckening (20) | Dole out 5000 total Survivor damage as a Special Infected. |
| Do Not Disturb (20) | Sneak past all Witches in a campaign without disturbing one. |
| Double Jump (20) | Pounce two different Survivors in one life as a Hunter. |
| Drag and Drop (20) | Rescue a Survivor from a Smoker's tongue before he takes damage. |
| Field Medic (20) | Heal 25 Survivors with a first aid kit. |
| Grim Reaper (15) | Survive the Blood Harvest campaign. |
| Ground Cover (30) | Save another Survivor from a Special Infected while on the ground. |
| Helping Hand (20) | Revive 50 incapacitated Survivors. |
| Hero Closet (10) | Rescue a Survivor trapped in a closet. |
| Hunter Punter (10) | Shove a Hunter off of a pinned and helpless Survivor. |
| Jump Shot (20) | Headshot a Hunter while he's leaping. |
| Lamb 2 Slaughter (20) | As an Infected, incap a Survivor who has entered and left a safe room. |
| Man vs Tank (30) | Single-handedly kill a Tank. |
| Mercy Killer (15) | Survive the No Mercy campaign. |
| My Bodyguard (15) | Protect any Survivor from an attacking Infected 50 times. |
| No Smoking Section (15) | Kill 10 Smokers as they are pulling helpless Survivors. |
| No-one Left Behind (20) | Beat a campaign with all 4 Survivors. |
| Nothing Special (30) | Survive a campaign with no Survivors taking damage from Special Infected. |
| Pharm-assist (20) | Give pain pills to 10 Survivors. |
| Pyrotechnician (20) | Blow up 20 Infected in a single explosion. |
| Red Mist (20) | Kill 1000 Infected with a mounted machine gun. |
| Safety First (30) | Play an entire campaign with no Survivors taking friendly fire damage. |
| Spinal Tap (10) | Kill an Infected with a single blow from behind. |
| Stand Tall (20) | Survive a campaign without being incapacitated. |
| Stomach Upset (20) | All Survivors complete a campaign without being vomited on. |
| Tankbusters (20) | Kill a Tank without it dealing any damage to a Survivor. |
| Toll Collector (15) | Survive the Death Toll campaign. |
| Tongue Twister (20) | Free yourself from a Smoker who has grabbed you with his tongue. |
| Towering Inferno (10) | Light a Tank with a Molotov. |
| Unbreakable (30) | Finish a campaign without ever being healed. |
| Untouchables (30) | No Survivors take damage after contacting the rescue vehicle. |
| What Are You Trying to Prove? (35) | Survive all campaigns on Expert. |
| Witch Hunter (20) | Kill a Witch without any Survivor taking damage from her. |
| Zombicidal Maniac (30) | Survive any campaign on Expert. |
| Zombie Genocidest (20) | Kill 53,595 Infected. |
