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