Here is the full list of all 12 Final Resistance achievements.
Obtained 2 pieces of legendary equipment simultaneously from the loot chest.
Blacksmith and Coach clear(Hard or above)
Blacksmith and Chef clear(Hard or above)
Blacksmith and Farmer clear(Hard or above)
Coach and Chef clear(Hard or above)
Coach and Farmer clear(Hard or above)
Chef and Farmer clear(Hard or above) without Double Dragons
Chef and Farmer cleared(Hard or above), with Fire Dragon and Reverence Divine talents
Archmage and Blacksmith Cooperative Clear (Hard or above)
Archmage and Coach Cooperative Clear (Hard or above)
Archmage and Chef Cooperative Clear (Hard or above)
Archmage and Farmer Cooperative Clear (Hard or above)