Here is the full list of all 24 Learn Japanese To Survive! Katakana War achievements.
Maximize all character's affection levels.
Clear the game.
Unlock the potential of corn soup.
Try 3 different types of seafood.
Complete all 20 side quests.
Obtain the ultimate sword.
Complete 15 side quests.
Complete lesson 10.
Visit the Challenge Castle.
Complete lesson 9.
Complete lesson 8.
Complete lesson 7.
Complete 10 side quests.
Maximize a character's affection level.
Complete lesson 6.
Complete lesson 5.
Complete 5 side quests.
Complete lesson 4.
Complete lesson 3.
View a character's affection event.
Unlock the power of the Crystarium
Complete a side quest.
Complete lesson 2.
Complete lesson 1.