Here is the full list of all 19 Senpai Teaches Me Japanese: Part 1 achievements.
Learn some foods in Japanese :3
Learn numbers in Japanese!
Complete the Y set.
Learn all of the characters.
Complete the R set.
Complete the M set.
Complete the N set.
Complete the P set.
Complete the B set.
Complete the H set.
Complete the D set.
Complete the T set.
Complete the Z set.
Complete the S set.
Complete the G set
Complete the K set.
Complete the vowel set.
Review characters in Flash cards.
Open the game.