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