FINAL FANTASY RESONANCE: Error de traducción (Workarounds)
Short answer
Suggested fix (unconfirmed): Cambia el idioma del juego a inglés para evitar el texto en francés. Espera a que los desarrolladores lancen un parche con la corrección.
The problem
Error de traducción en la versión en español la habilidad "Versátil" de una de las visiones que puedes conseguir en el capítulo 5 no diré por spoilers, la descripción de la habilidad está en francés
It worked fine for me. Maybe try pushing another Main Quest or two and try again to see if its a specific quest state that prohibits you getting the hammer?
Suggested fix (unconfirmed): Completely close the game before putting your device into sleep mode. Alternatively, ignore the discrepancy since it does not affect gameplay.
Suggested fix (unconfirmed): Double-check your kills against an expanded guide that includes Jotunn, as common lists often miss it. If you have definitely killed all 15, try verifying your game files or defeating them again while online to trigger the achievement.
Suggested fix (unconfirmed): Grind levels and vision ranks by farming Cactuar enemies and Fairy Pots near cactus plants on every island. Prioritize vision skills that grant multiple actions and swap visions frequently to earn AP+8 level 4 bonuses.