Here is the full list of all 31 Kids of Hellas: Back to Olympus achievements.
Erect 30 buildings!
Activate the "Freezing time" bonus three times on the same level!
Use all the bonuses at least once while playing the game!
Find 10 puzzle pieces!
Complete 10 levels!
Complete 10 levels with 3 stars!
Gather 500 units of gold!
Encounter a patrolling enemy once!
Assign 1000 tasks to the kids!
Use your skill 20 times!
Summon 5 kids simultaneously!
Use two bonuses simultaneously!
Complete the level without using skills!
Gather 500 units of food!
Gather 100 units of gold!
Use your skill
Repair the mana well!
Gather 100 units of food!
Complete one level with 3 stars!
Complete the 1st level!
Cancel a task!
Find the first puzzle piece!
Complete 30 levels with 3 stars!
Find 40 puzzle pieces!
Activate the "Speed up character" bonus three times on the same level!
Complete any level with three stars without using any bonuses!
Find 20 puzzle pieces!
Encounter a patrolling enemy 30 times!
Repair the ancient Greek ship!
Cancel a task 30 times!
Earn all the achievements!