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