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.
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.
Kill an Ogre with the Howitzer.
Kill 10 Ridden with Bob's Arm.
Win a game in Swarm Mode.
Kill a Monstrous Breaker after removing all of its armor.
Complete a mission with each of the original Cleaners.
Complete a map without any players on the team killing a single Ridden.
Find the secret in The Abomination.
Find the secret in Job 10:22.
Find the secret in Blue Dog Hollow.
Defend the jukebox in Bar Room Blitz without it breaking.
Find the secret in Search & Rescue.
Find the secret in The Devil's Return.
Complete Act 4 on Recruit difficulty or higher.
Complete Remnants.
Complete all Act 3 maps on Recruit difficulty or higher.
Find the secret in Remnants.
Heal a teammate.
Complete Dr. Rogers' Neighborhood.
Find the secret in Dr. Rogers' Neighborhood.
Complete Job 10:22.
Complete all Act 2 maps on Recruit difficulty or higher.
Kill 15 enemies while downed.
Complete Plan B.
Make a Breaker hurt itself.
Find the secret in Plan B.
Kill a Snitch without it alerting the horde.
Complete The Armory.
Find the secret in The Armory.
Spend your first Supply Point.
Complete Blue Dog Hollow.
Complete all Act 1 maps on Recruit difficulty or higher.
Drop some ammo for a teammate.
Complete The Dark Before The Dawn.
Kill at least one of each non-boss Mutation.
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 map without ever triggering a horde from Reekers, Birds, Snitches, or alarms.
Play 25 cards in a single match.
Complete a level while getting at least 50 kills with melee weapons.
Revive a fallen teammate.
Complete a mission without any players being incapacitated or killed.
Safely descend the ladder in the construction zone in Resurgence.
Good luck out there, you're gunna need it.
Form a party in Fort Hope.
Complete All Ridden Hives.
Find the Secret in The Nursery.
Find the Secret in Blood Stream.
Find the Secret in Sunken Passages.
Find the Secret in 300 Below.
Get a kill with a Legendary Weapon.
Find the Secret in Brood Lair.
Find the Secret in The Cut.
Find the Secret in Caustic Cesspool.
Kill each of the Warped Ridden
Earn some Skull Totems.
Kill 10 Ridden with a Skull Totem.
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.
Complete a map in Trial of the Worm with a total modifier of at least x20.
Earn a score of at least 100,000 in Trial of the Worm.
Play Trial of the Worm for the first time.
Blow up a Food Item with the LAW.
Defeat The Harbinger without using the LAW.
Land a final blow on a Boss Mutation with the LAW.
Set an enemy on fire with the Flamethrower, while also being on fire.
Complete all Act 6 maps on Recruit difficulty or higher.
Find the Secret in Act 6.
Kill all variants of the Sentinel.