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