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.
Forged a strong bond with Machias.
Forged a strong bond with Gaius.
Read the decoded Black Records and had an encounter you'll never forget.
Completed all of the character profiles in the notebook.
Opened every chest between the Prologue and the Finale.
Slayed Isra-Zamiel in Glacia Shrine.
Acquired over a million mira.
Forged a strong bond with Alfin.
Forged a strong bond with Emma.
Forged a strong bond with Laura.
Forged a strong bond with Fie.
Forged a strong bond with Jusis.
Forged a strong bond with Elliot.
Forged a strong bond with Millium.
Forged a strong bond with Sara.
Completed the game on nightmare difficulty.
Completed the game on hard or nightmare difficulty.
Completed the Epilogue.
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).
Canceled enemy arts and crafts 100 times.
Initiated 300 advantage encounters (including double and triple advantage).
Received the Grand Cordon of the Order of the Phoenix Wings from Emperor Eugent III.
Gathered all 31 varieties of master quartz.
Achieved student rank A0.
Caught all 24 varieties of fish.
Acquired the strongest weapon for any character.
Forged a strong bond with Towa.
Forged a strong bond with Alisa.
Raised any two characters to Link Level 7.
Obtained all 22 recipes.
Completed Act 2.
Used Overdrive in battle 100 times.
Raised a master quartz to level 5.
Won 600 battles.
Used Rush in battle 100 times.
Used 100 S-Breaks in battle.
Completed the Intermission.
Completed Act 1.
Defeated 8 enemies at once.
Used over 500 follow-up attacks in battle.
Used Burst in battle 50 times.
Won a battle with a tactical bonus of x3.0 or greater.
Earned an S rank during part of any chapter.
Won 100 battles.
Completed the Prologue.
Woke up in the Eisengard Range.