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