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