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