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