Here is the full list of all 23 Magic Flute achievements.
Has found Tamino on Stage IX
Has used a ladder for the first time
Has left just one white platform on Stage VI
Has run away from Snake for the first time
Has finished the first level
Has finished tutorials
Has let the Snake bite you
Has stepped on a cracked platform and fell down
Has found the Queen of the Night
Has started the lift for the first time
Has entered Sarastro's Temple
Has completed a stage in under 10 seconds
Has completed all stages featuring disco lights
Has completed a stage in over 30 minutes
Has got caught by the Monkey
Has run away from the Monkey
Has used the Magic Bells for the first time
Has caught Monostatos Slave in a cage for the first time
Has stepped in a torch light
Has freed Pamina from prison
Has found the medallion with a picture of Pamina
Has completed all levels
Has earned 3 points in every level