Here is the full list of all 15 Madu Maths achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Achieve an A+ grade in Easy+.
Fill the hive in Medium+.
Fill the hive in Medium-.
Fill the hive in Easy-.
Fill the hive in Easy+.
Achieve an A grade.
Fill the hive after 1 or more Buzzing bonuses.
Fill the hive after 2 or more Buzzing bonuses.
Fill the hive in Hard.
Achieve an A+ grade in Easy-.
Achieve an A+ grade in Medium+.
Achieve an A+ grade in Medium-.
Achieve an A+ grade in Hard.
Fill the hive after 3 or more Buzzing bonuses.
Collect a total of 20,000 Honey.