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