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