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