Here is the full list of all 11 Meet My Teacher achievements.
Finish 10 levels of Selenia
You missed 5 times!
Finish a level in Very Hard!
Finish 10 levels of Cathrine
100 letters written!
Complete 25 words!
Complete 10 words!
Start your first game!
500 letters written!
Finish 10 levels of Althea
Save a picture in the gallery