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