Full list of all 93 Back 4 Blood achievements worth 1,380 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game.
The base game contains 55 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 38 achievements worth 380 Gamerscore.
Kill a Monstrous Breaker after removing all of its armor.
Complete all Act 1 maps on Veteran difficulty or higher.
Make a Breaker hurt itself.
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.
Heal a teammate.
Drop some ammo for a teammate.
Find the secret in "Dr. Rogers' Neighborhood".
Kill a Snitch without it alerting the horde.
Rescue a teammate from a cocoon.
Complete The Armory.
Complete Plan B.
Complete Job 10:22.
Complete all Act 2 maps on Recruit difficulty or higher.
Kill 10 Ridden with Bob's Arm.
Find the secret in "Job 10:22".
Find the secret in "Plan B".
Find the secret in "The Armory".
Complete a map without any players on the team killing a single Ridden.
Complete Blue Dog Hollow.
Complete all Act 1 maps on Recruit difficulty or higher.
Complete a level while getting at least 50 kills with melee weapons.
Find the secret in "Blue Dog Hollow".
Defend the jukebox in Bar Room Blitz without it breaking.
Spend your first Supply Point.
Complete Search & Rescue.
Complete The Dark Before The Dawn.
Complete a mission without any players being incapacitated or killed.
Complete a map without ever triggering a horde from Reekers, Birds, Snitches, or alarms.
Kill at least one of each non-boss Mutation.
Complete The Devil's Return.
Find the secret in "The Dark Before the Dawn".
Find the secret in "Search & Rescue".
Find the secret in "The Devil's Return".
Safely descend the ladder in the construction zone in Resurgence.
Form a party in Fort Hope.
Revive a fallen teammate.
Kill 15 enemies while downed.
Play 25 cards in a single match.
Good luck out there, you're gunna need it.
Complete all Act 1 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 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 an Ogre with the Howitzer.
Complete a mission with each of the original Cleaners.
Win a game in Swarm Mode.
Find the Secret in Blood Stream.
Find the Secret in Sunken Passages.
Find the Secret in The Nursery.
Find the Secret in Caustic Cesspool.
Earn some Skull Totems.
Kill 10 Ridden with a Skull Totem.
Find the Secret in Brood Lair.
Kill each of the Warped Ridden.
Complete All Ridden Hives.
Get a kill with a Legendary Weapon.
Find the Secret in The Cut.
Find the Secret in 300 Below.
Jump over a Cultist Bear Trap without triggering it.
Use a Smoke Grenade to become hidden while at Critical Health.
Bring 11 Duffel Bags to Saferooms.
Have at least five different Food Buffs active at one time.
Complete all Act 5 maps on Recruit difficulty or higher.
Find the Secret in Act 5.
Complete all Act 5 maps on Veteran difficulty or higher.
Complete all Act 5 maps on Nightmare difficulty or higher.
Complete all Act 5 maps on No Hope difficulty.
Hit a Pusflinger with a Bait Jar.
Kill a Slasher with Iron Claws.
Kill a Sniper with a Sniper Rifle.
Kill a Crone with the Bow.
Kill all variants of the Sentinel.
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 Flame Thrower, while also being on fire.
Defeat The Harbinger without using the LAW.
Blow up a Food Item with the LAW.
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.