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