Here is the full list of all 11 Zeus vs Monsters - there are Math Game for kids achievements.
Open the game
Beat the first 10 levels
Complete 25 levels
Complete all 50 levels
Solve 25 levels with difficulty set on easy and using all 4 operations with the range of 0-1000
Solve 50 levels with difficulty set on easy and using all 4 operations with the range of 0-1000
Solve 25 levels with difficulty set on medium and using all 4 operations with the range of 0-1000
Solve 50 levels with difficulty set on medium and using all 4 operations with the range of 0-1000
Solve 25 levels with difficulty set on hard and using all 4 operations with the range of 0-1000
Solve 50 levels with difficulty set on hard and using all 4 operations with the range of 0-1000
Beat all bosses