Full list of all 65 KILLING FLOOR 2 achievements worth 1,420 gamerscore. It takes around 25-30 hours to unlock all of the achievements in the base game.
The base game contains 37 achievements worth 1,000 Gamerscore, and there are 23 DLC packs containing 28 achievements worth 420 Gamerscore.
Collect all the items on "The Tragic Kingdom"
Collect all the items on Evacuation Point
Collect all the items on Outpost
Collect all the items on Prison
Reach Level 25 on Any Perk
Win a VS Survival Round Playing as the Humans
Collect all the Items in Infernal Realms
Collect all the items on Biotics Lab
Reach Level 20 on Any Perk
Win Any Match on Suicidal Difficulty
Collect All the Items on Hostile Grounds
Collect all the items on Nuked
Collect all the items on Paris
Reach Level 15 on Any Perk
Win Any Match on Hard Difficulty
Win 25 Multiplayer Matches
Collect all the items on The Descent
Collect all the items on Catacombs
Win a VS Survival Round Playing as the Zeds
Collect all the items on Black Forest
Kill the Patriarch Before He Has a Chance to Heal
Win 10 Multiplayer Matches
Kill Dr. Hans Volter For the First Time
Collect all the items on Farmhouse
Reach Level 10 on Any Perk
Collect all the volley balls on Zed Landing
Give 1000 Dosh to Another Player During a Multiplayer Match
Collect All the Items on Containment Station
Reach Level 5 on Any Perk
Heal a Teammate With the Syringe
Kill Your First Fleshpound
Kill Your First Scrake
Weld a Door to 100%
Win 1 Multiplayer Match
Collect all the items on Volter Manor
Kill a Siren Before She Screams
Win Any Match on Hell on Earth Difficulty
Collect all the items (skulls) on "Nightmare"
Collect all the items (Snowglobes) on Krampus Lair
Collect all the items (D.A.R. Bobbleheads) on DieSector
Collect all the items (Batteries) on Power Core
Collect all the items (Batteries) on Lockdown
Collect all the items (Steam Cells) on Airship
Destroy 10 Glowing Skulls in Monster Ball
Unlock the Alchemist Room in Monster Ball
Destroy 10 Snow Globes in Santa's Workshop
Destroy 10 Dosh Necklaces in Shopping Spree
Destroy 10 Dosh Necklaces in Spillway
Destroy 10 Steam Batteries on Steam Fortress
Destroy 10 red skulls on Ashwood Asylum
Defeat the Matriarch on any difficulty
Find all the Collectibles on Sanitarium
Destroy 10 gold trophies on Biolapse
Collect 10 Holographic projectors on Desolation
Find all collectibles on Moonbase
Destroy 10 Demon Skulls on Hellmark Station
Find all collectibles on Netherhold
Destroy 10 Snow Globes in Carillon Hamlet
Complete wave 15 on Endless Hard or higher difficulty on Elysium
Find all the collectibles on Dystopia 2029
Collect 10 Holographic Projectors in Rig
Collect 10 Glowing Skulls in Barmwich Town
Collect 10 Snow Globes in Crash
Collect 10 Holographic Projectors in Subduction
Collect 10 Hans Volter Dolls in Castle Volter