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