Here is the full list of all 51 The Legend of Heroes: Sen no Kiseki II KAI -The Erebonian Civil War- achievements.
Earned all trophies.
Completed the game on nightmare difficulty.
Read the decoded Black Records and had an encounter you'll never forget.
Completed all of the character profiles in the notebook.
Slayed Isra-Zamiel in Glacia Shrine.
Forged a strong bond with Fie.
Forged a strong bond with Sara.
Forged a strong bond with Emma.
Forged a strong bond with Laura.
Forged a strong bond with Millium.
Forged a strong bond with Jusis.
Forged a strong bond with Alfin.
Forged a strong bond with Gaius.
Forged a strong bond with Elliot.
Completed the game on hard or nightmare difficulty.
Completed the Epilogue.
Achieved student rank A0.
Completed all 39 quests.
Completely filled the book section of the notebook (excluding books only available in NG+).
Completed the Divertissement.
Completed the Finale.
Completely filled the monster guide (excluding EX sections).
Acquired over a million mira.
Opened every chest between the Prologue and the Finale.
Received the Grand Cordon of the Order of the Phoenix Wings from Emperor Eugent III.
Gathered all 31 varieties of master quartz.
Caught all 24 varieties of fish.
Acquired the strongest weapon for any character.
Forged a strong bond with Alisa.
Forged a strong bond with Towa.
Forged a strong bond with Machias.
Raised any two characters to Link Level 7.
Obtained all 22 recipes.
Completed Act 2.
Initiated 300 advantage encounters (including double and triple advantage).
Canceled enemy arts and crafts 100 times.
Raised a master quartz to level 5.
Won 600 battles.
Used Rush in battle 100 times.
Used Overdrive in battle 100 times.
Earned an S rank during part of any chapter.
Used over 500 follow-up attacks in battle.
Completed the Intermission.
Completed Act 1.
Used Burst in battle 50 times.
Used 100 S-Breaks in battle.
Won a battle with a tactical bonus of x3.0 or greater.
Won 100 battles.
Completed the Prologue.
Defeated 8 enemies at once.
Woke up in the Eisengard Range.