Full list of all 93 Back 4 Blood achievements. It takes around 120-150 hours to unlock all of the achievements in the base game on Windows.
The base game contains 55 achievements, and there are 3 DLC packs containing 38 achievements.
Complete a map without any players on the team killing a single Ridden.
Find the secret in The Abomination.
Find the secret in Remnants.
Find the secret in Dr. Rogers' Neighborhood.
Find the secret in Job 10:22.
Find the secret in The Armory.
Find the secret in Search & Rescue.
Find the secret in The Devil's Return.
Kill a Monstrous Breaker after removing all of its armor.
Complete all Act 2 maps on Nightmare difficulty.
Complete Act 4 on Recruit difficulty or higher.
Complete Act 4 on Veteran difficulty or higher.
Complete Act 4 on Nightmare difficulty.
Complete Remnants.
Complete all Act 3 maps on Recruit difficulty or higher.
Complete all Act 3 maps on Veteran difficulty or higher.
Complete Dr. Rogers' Neighborhood.
Complete Job 10:22.
Complete all Act 2 maps on Recruit difficulty or higher.
Complete all Act 2 maps on Veteran difficulty or higher.
Revive a fallen teammate.
Complete Plan B.
Drop some ammo for a teammate.
Find the secret in Plan B.
Complete The Armory.
Kill 15 enemies while downed.
Complete all Act 1 maps on Veteran difficulty or higher.
Kill an Ogre with the Howitzer.
Find the secret in Blue Dog Hollow.
Make a Breaker hurt itself.
Spend your first Supply Point.
Complete Blue Dog Hollow.
Complete all Act 1 maps on Recruit difficulty or higher.
Complete The Dark Before The Dawn.
Find the secret in The Dark Before the Dawn.
Kill at least one of each non-boss Mutation.
Complete Search & Rescue.
Heal a teammate.
Rescue a teammate from a cocoon.
Complete The Devil's Return.
Complete a level while getting at least 50 kills with melee weapons.
Kill a Snitch without it alerting the horde.
Complete a mission without any players being incapacitated or killed.
Complete a map without ever triggering a horde from Reekers, Birds, Snitches, or alarms.
Safely descend the ladder in the construction zone in Resurgence.
Play 25 cards in a single match.
Good luck out there, you're gunna need it.
Form a party in Fort Hope.
Complete all Act 1 maps on Nightmare difficulty.
Complete all Act 3 maps on Nightmare difficulty.
Kill 53,600 Ridden over your career.
Complete a mission with each of the original Cleaners.
Defend the jukebox in Bar Room Blitz without it breaking.
Kill 10 Ridden with Bob's Arm.
Win a game in Swarm Mode.
Find the Secret in Caustic Cesspool.
Find the Secret in Blood Stream.
Kill 10 Ridden with a Skull Totem.
Get a kill with a Legendary Weapon.
Kill each of the Warped Ridden
Earn some Skull Totems.
Complete All Ridden Hives.
Find the Secret in The Nursery.
Find the Secret in Sunken Passages.
Find the Secret in The Cut.
Find the Secret in Brood Lair.
Find the Secret in 300 Below.
Defeat The Harbinger without using the LAW.
Find the Secret in Act 6.
Complete all Act 6 maps on Recruit difficulty or higher.
Complete all Act 6 maps on Veteran difficulty or higher.
Land a final blow on a Boss Mutation with the LAW.
Set an enemy on fire with the Flamethrower, while also being on fire.
Kill all variants of the Sentinel.
Complete all Act 6 maps on Nightmare difficulty or higher.
Complete all Act 6 maps on No Hope difficulty.
Play Trial of the Worm for the first time.
Earn a score of at least 100,000 in Trial of the Worm.
Complete a map in Trial of the Worm with a total modifier of at least x20.
Blow up a Food Item with the LAW.