Here is the full list of all 26 Warhammer: Vermintide 2 achievements. It takes around 120-150 hours to unlock all of the achievements on Windows.
Reach level 30 with Kerillian
Reach Level 30 with all characters
Reach level 30 with Saltzpyre
Equip a Veteran Item
Reach level 30 with Sienna
Reach level 30 with Kruber
Reach level 30 with Bardin
Complete Skittergate on Legend
Unlock all Talent points for 1 career
Equip Exotic items in every slot
Complete a level as every Hero
Craft 50 items
Complete Skittergate on Champion
Complete Skittergate on Veteran
Equip an Exotic Item
Complete Skittergate on Recruit
Complete Act 3
Salvage 100 items
Equip a Rare Item
Complete Act 2
Unlock 1st Talent point
Complete Act 1
Craft an Item
Equip a Common Item
Salvage an item
Complete Prologue