Here is the full list of all 53 The Legend of Heroes: Sen no Kiseki IV -THE END OF SAGA- achievements.
Earned all achievements.
Completed the game on nightmare difficulty.
Completely filled the character section in the notebook.
Spent the evening before the final battle with Emma.
Spent the evening before the final battle with Laura.
Completely filled the battle section in the notebook. (Besides the Extra category)
Reached the true ending.
Completed the finale.
Opened every treasure chest.
Achieved a Unity Grade of Unbreakable.
Completed all quests.
Gathered all 5 lost arts quartz.
Gathered all 31 varieties of master quartz.
Achieved a Special Ops rank of A0.
Opened every trial chest.
Completely filled the recipe section in the notebook.
Completely filled the cards section in the notebook.
Took all landscape photos and reported them to Rex.
Won against all opponents in Pom! Pom! Party!
Acquired over a million mira.
Completely filled the books section in the notebook.
Completely filled the fishing section in the notebook. (All 30 types of fish + Rod Lv. Max)
Raised a master quartz to level 10.
Forged a strong bond with Celine and Duvalie.
Forged a strong bond with Kurt, Ash, Elliot, Machias, Jusis, Gaius, and Crow.
Spent the evening before the final battle with Juna.
Spent the evening before the final battle with Altina.
Spent the evening before the final battle with Musse.
Spent the evening before the final battle with Fie.
Spent the evening before the final battle with Sara.
Spent the evening before the final battle with Towa.
Spent the evening before the final battle with Alfin.
Spent the evening before the final battle with Elise.
Spent the evening before the final battle with Alisa.
Completed Eventide.
Completed Act 3.
Raised any two characters to Link Level 7.
Initiated 300 advantage encounters. (Including double and triple advantage)
Won 700 battles.
Completed Act 2.
Inflicted Break over 800 times.
Earned an S-Rank on any act.
Completed Fragments.
Completed Act 1.
Used 100 S-Crafts in battle.
Used Brave Order in battle over 100 times.
Used over 500 follow-up attacks in battle.
Used Rush in battle 100 times.
Used Burst in battle 50 times.
Won 100 battles.
Won a battle with a tactical bonus of x3.0 or greater.
Completed the prologue.
Infiltrated Orchis Tower.