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