Here is the full list of all 26 Tribes of Midgard achievements.
Reach Season Level 25
Spend 100,000 Souls in Miðgarð
Successfully revive a villager
Deliver the final blow to defeat a Saga Boss in Saga Mode
Craft a Legendary Item in any Mode
Complete a Saga Quest in Saga Mode
Deliver the final blow to defeat an Ice Jötunn in any Mode
Deliver the final blow to defeat a Dark Jötunn in any Mode
Deliver the final blow to defeat a Fire Jötunn in any Mode
Spend 10,000 Souls in Miðgarð
Have 100 Constructions in any Mode
Reach Season Level 10
Craft a Rare Item in any Mode
Craft an Epic Item in any Mode
Deliver the final blow to defeat a Thunder Jötunn in any Mode
Reach Season Level 5
Successfully revive an ally player
Reach Season Level 2
Craft an Uncommon Item in any Mode
Craft a Common Item in any Mode
Play a game with a Pet equipped
Spend 1,000,000 Souls in Miðgarð
Reach Last Season Level
Complete the Tutorial
Reach Day 100 in Survival Mode
Hold 10,000 Souls or more in Saga Mode