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