Here is the full list of all 15 Kagami: An Odyssey in Japanese Language Learning achievements.
Defeated the vampire tree Jubokko
Defeated the Best-Selling Author/Evil Entity Ashura
Defeated Tatsu: the Gameshow Host with the Most
Defeated the Greedy Dodomeki
Defeated the Well-Choreographed Guardians of the Underworld
Overcame Your Characters Personified Self-Doubt
How did you get this Achievement?
Squeezing your way to the front row
You knocked it out of the park!
Learned yourself some Hiragana
Welcome to Kagami! :3
Thanks for playing! :3
You found my secret spot! Don't Tell Justin...
Returned the facial Hair to its rightful owner
You found my secret spot! Don't tell Zach...