Here is the full list of all 44 Viking Brothers 3 achievements.
For earning every achievement.
For unlocking five taverns in the main adventure.
For helping the gods in the final battle.
For finding Odin's spear.
For acquiring the Travel Amulet.
For earning three stars on 30 levels.
For encountering 30 patrolling enemies.
For finding the three Places of Power.
For canceling 30 tasks.
For earning one star on one level.
For not clicking the mouse for 30 seconds.
For gathering 1,000 units of gold.
For finding Heimdall's sword.
For gathering 1,000 units of wood.
For earning three stars while playing Chipmaster.
For gathering 1,000 units of stone.
For using a booster 100 times.
For finding Thor's hammer.
For gathering 1,000 units of food.
For gathering 500 units of gold.
For gathering 500 units of wood.
For gathering 500 units of stone.
For exchanging gold for mana 50 times.
For upgrading 30 buildings.
For unlocking a tavern.
For fixing the Rainbow Bridge.
For gathering 500 units of food.
For building 30 buildings.
For earning three stars on 10 levels.
For using the running booster 10 times.
For destroying an enemy tower.
For encountering a patrolling enemy.
For exchanging gold for mana 10 times.
For gathering 100 units of gold.
For exchanging gold for mana.
For giving Vikings 300 tasks.
For gathering 100 units of wood.
For gathering 100 units of stone.
For giving the Vikings five tasks at once.
For gathering 100 units of food.
For completing a level without using a booster.
For using a booster.
For earning three stars on one level.
For canceling a task.