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