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