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