Here is the full list of all 40 Viking Brothers 4 achievements.
For using a booster.
For using a booster 100 times.
For gathering 100 units of food.
For gathering 1,000 units of food.
For gathering 100 units of wood.
For gathering 1,000 units of wood.
For gathering 100 units of stone.
For gathering 1,000 units of stone.
For gathering 100 units of gold.
For gathering 1,000 units of gold.
For completing a level with three gold stars.
For completing 10 levels with three gold stars.
For completing 30 levels with three gold stars.
For canceling a task.
For canceling 30 tasks.
For giving 300 tasks to the Vikings.
For completing a level without using a booster.
For giving the Vikings five tasks at once.
For encountering a patrolling enemy.
For meeting a patrolling enemy 30 times.
For earning every achievement.
For unlocking a tavern.
For unlocking five taverns in the main adventure.
For earning three stars while playing Chipmaster.
For persuading Loki to join the cause.
For acquiring the underwater breathing potion.
For restoring the magic well.
For finding the underwater stalker.
For acquiring information about the stolen artifact.
For finding the first fragment of the Divine Bonds.
For destroying Mittalmar's magic dome.
For solving the central gate puzzle.
For assembling the Divine Bonds.
For dispelling darkness.
For finding the Hammer of Creation and Anvil of Worlds.
For restoring the glory of the worlds of Edda.
For gathering 100 pearls.
For gathering 1,000 pearls.
For dispelling a storm cloud 30 times.
For getting rained on 100 times.