Full list of all 14 Battle Islands achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox One.
Remove 8 obstacles from your islands
Complete the tutorial
Attain 100 offensive victories against the enemy
Loot 2500000 supplies from the enemy
Promote the warship in the command bunker
Upgrade a supply depot to rank 10
Attain 10 consecutive victories against the enemy
Expand your base to 4 islands
Promote the bomber in the command bunker
Garrison 500 army units
Lose 500 riflemen in battle
Upgrade command bunker to rank 8
Acquire 2500 dog tags from the enemy
Attain 45 stars in the campaign