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