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