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.
Complete Skittergate on Legend
Reach level 30 with Bardin
Reach Level 30 with all characters
Reach level 30 with Kruber
Reach level 30 with Sienna
Reach level 30 with Saltzpyre
Equip a Veteran Item
Complete Skittergate on Champion
Complete a level as every Hero
Complete Prologue
Craft 50 items
Reach level 30 with Kerillian
Unlock all Talent points for 1 career
Craft an Item
Equip Exotic items in every slot
Salvage 100 items
Salvage an item
Equip an Exotic Item
Complete Skittergate on Recruit
Complete Skittergate on Veteran
Complete Act 2
Complete Act 1
Complete Act 3
Equip a Rare Item
Unlock 1st Talent point
Equip a Common Item