Here is the full list of all 49 Utawarerumono: Prelude to the Fallen achievements.
Obtained all achievements.
Listened to every BGM.
Viewed all event scenes.
Completed Where the Wild Things March.
Completely filled out the encyclopedia.
Acquired all rewards from training.
Used every main character's co-op chain.
Used every main character's final strike.
Completed all training battles.
Tried training.
Dealt 1,800+ damage to a single enemy.
Reached the ending.
Completed Great Seal - Part 2.
Completed Demander of Power.
Completed Primordial Dream - Part 2.
Completed Kuuya.
Completed Mask.
Completed The Fallen.
Completed Burning Prison.
Completed Abh-kamu.
Completed Hunter & Hunted - Part 2.
Completed Hansana Offense & Defense.
Dealt 750+ damage to a single enemy.
Completed The Daybreakers.
Completed Abandoned Feelings.
Completed Princess of a Fallen Empire.
Completed Pursuit.
Completed Karulawaturei.
Completed Infiltration.
Dealt 300+ damage to a single enemy.
Completed Giriyaginan Gladiator.
Completed False Truths - Part 2.
Completed Battle to the Death on the Bridge.
Completed Evenkurugan Woman.
Completed Special Attack.
Tried a free battle.
Completed Blocking the Shikeripechim Invasion.
Completed Decisive Battle.
Completed Imperial Capital Invasion.
Used a final strike.
Completed Nuwangi.
Completed Tatokori Gate.
Completed Daughter of the Forest.
Used a co-op chain.
Completed Path of No Return.
Completed Revolt.
Completed Ruler of the Wild Forest.
Completed Uninvited Guests.
Successfully performed a chain attack.