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