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.
Used every main character's final strike.
Used every main character's co-op chain.
Completed Mask.
Completed The Fallen.
Completed Burning Prison.
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.
Dealt 1,800+ damage to a single enemy.
Completed Infiltration.
Completed Giriyaginan Gladiator.
Dealt 750+ damage to a single enemy.
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.
Completed Decisive Battle.
Dealt 300+ damage to a single enemy.
Completed Imperial Capital Invasion.
Completed Nuwangi.
Completed Tatokori Gate.
Completed Daughter of the Forest.
Used a final strike.
Used a co-op chain.
Completed Path of No Return.
Completed Revolt.
Completed Ruler of the Wild Forest.
Tried a free battle.
Completed Uninvited Guests.
Successfully performed a chain attack.