Here is the full list of all 53 The Legend of Heroes: Trails of Cold Steel IV achievements.
Mastered Trails of Cold Steel IV and earned every achievement.
Spent the evening before the final battle with Alfin.
Spent the evening before the final battle with Emma.
Completed the game on nightmare difficulty.
Spent the evening before the final battle with Elise.
Completely filled the character section in the notebook.
Spent the evening before the final battle with Musse.
Forged a strong bond with Kurt, Ash, Elliot, Machias, Jusis, Gaius, and Crow.
Spent the evening before the final battle with Towa.
Spent the evening before the final battle with Sara.
Spent the evening before the final battle with Fie.
Forged a strong bond with Celine and Duvalie.
Reached the true ending.
Completely filled the battle section in the notebook. (Besides the Extra category)
Completed the finale.
Opened every treasure chest.
Acquired over a million mira.
Achieved a Unity Grade of Unbreakable.
Gathered all 31 varieties of master quartz.
Achieved a Special Ops rank of A0.
Completed all quests.
Gathered all 5 lost arts quartz.
Opened every trial chest.
Won against all opponents in Pom! Pom! Party!
Took all landscape photos and reported them to Rex.
Completely filled the fishing section in the notebook. (All 30 types of fish + Rod Lv. Max)
Completely filled the books section in the notebook.
Completely filled the recipe section in the notebook.
Completely filled the cards section in the notebook.
Raised a master quartz to level 10.
Spent the evening before the final battle with Laura.
Spent the evening before the final battle with Juna.
Spent the evening before the final battle with Altina.
Completed Eventide.
Spent the evening before the final battle with Alisa.
Completed Act 3.
Completed Act 2.
Won 700 battles.
Completed Fragments.
Completed Act 1.
Raised any two characters to Link Level 7.
Initiated 300 advantage encounters. (Including double and triple advantage)
Inflicted Break over 800 times.
Used 100 S-Crafts in battle.
Used Rush in battle 100 times.
Used Burst in battle 50 times.
Used over 500 follow-up attacks in battle.
Earned an S-Rank on any act.
Used Brave Order in battle over 100 times.
Won a battle with a tactical bonus of x3.0 or greater.
Won 100 battles.
Completed the prologue.
Infiltrated Orchis Tower.