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 Act 4 on Nightmare difficulty.
Complete all Act 3 maps on Nightmare difficulty.
Complete all Act 2 maps on Nightmare difficulty.
Complete all Act 1 maps on Nightmare difficulty.
Kill a Monstrous Breaker after removing all of its armor.
Kill an Ogre with the Howitzer.
Complete a mission with each of the original Cleaners.
Complete a map without any players on the team killing a single Ridden.
Kill 53,600 Ridden over your career.
Complete Act 4 on Veteran difficulty or higher.
Complete all Act 3 maps on Veteran difficulty or higher.
Find the secret in The Abomination.
Find the secret in Blue Dog Hollow.
Find the secret in The Dark Before the Dawn.
Complete all Act 2 maps on Veteran difficulty or higher.
Find the secret in Search & Rescue.
Find the secret in The Devil's Return.
Find the secret in The Armory.
Find the secret in Job 10:22.
Find the secret in Remnants.
Find the secret in Dr. Rogers' Neighborhood.
Find the secret in Plan B.
Complete all Act 1 maps on Veteran difficulty or higher.
Make a Breaker hurt itself.
Form a party in Fort Hope.
Kill 10 Ridden with Bob's Arm.
Defend the jukebox in Bar Room Blitz without it breaking.
Win a game in Swarm Mode.
Complete all Act 1 maps on Recruit difficulty or higher.
Safely descend the ladder in the construction zone in Resurgence.
Complete Act 4 on Recruit difficulty or higher.
Drop some ammo for a teammate.
Rescue a teammate from a cocoon.
Kill 15 enemies while downed.
Complete Remnants.
Complete all Act 3 maps on Recruit difficulty or higher.
Complete Dr. Rogers' Neighborhood.
Complete a level while getting at least 50 kills with melee weapons.
Complete Job 10:22.
Complete all Act 2 maps on Recruit difficulty or higher.
Complete Plan B.
Complete The Armory.
Spend your first Supply Point.
Good luck out there, you're gunna need it.
Revive a fallen teammate.
Heal a teammate.
Complete a map without ever triggering a horde from Reekers, Birds, Snitches, or alarms.
Complete Blue Dog Hollow.
Kill a Snitch without it alerting the horde.
Play 25 cards in a single match.
Complete The Dark Before The Dawn.
Kill at least one of each non-boss Mutation.
Complete a mission without any players being incapacitated or killed.
Complete Search & Rescue.
Complete The Devil's Return.
Find the Secret in Sunken Passages.
Find the Secret in The Nursery.
Find the Secret in The Cut.
Find the Secret in Caustic Cesspool.
Find the Secret in 300 Below.
Get a kill with a Legendary Weapon.
Complete All Ridden Hives.
Find the Secret in Brood Lair.
Earn some Skull Totems.
Kill 10 Ridden with a Skull Totem.
Kill each of the Warped Ridden
Find the Secret in Blood Stream.
Land a final blow on a Boss Mutation with the LAW.
Play Trial of the Worm for the first time.
Blow up a Food Item with the LAW.
Complete all Act 6 maps on Recruit difficulty or higher.
Complete all Act 6 maps on Veteran difficulty or higher.
Defeat The Harbinger without using the LAW.
Set an enemy on fire with the Flamethrower, while also being on fire.
Find the Secret in Act 6.
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.
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.