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