Here is the full list of all 49 Utawarerumono: Prelude to the Fallen achievements.
Obtained all achievements.
Viewed all event scenes.
Completed Where the Wild Things March.
Listened to every BGM.
Completely filled out the encyclopedia.
Reached the ending.
Completed Great Seal - Part 2.
Completed Demander of Power.
Completed Primordial Dream - Part 2.
Acquired all rewards from training.
Completed all training battles.
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.
Used every main character's co-op chain.
Completed Abandoned Feelings.
Dealt 1,800+ damage to a single enemy.
Completed Princess of a Fallen Empire.
Completed Pursuit.
Completed Karulawaturei.
Completed Infiltration.
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.
Tried training.
Dealt 750+ damage to a single enemy.
Dealt 300+ damage to a single enemy.
Completed Decisive Battle.
Completed Imperial Capital Invasion.
Completed Nuwangi.
Completed Tatokori Gate.
Completed Daughter of the Forest.
Used a co-op chain.
Used a final strike.
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.