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