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