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