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