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