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.
Dealt 1,800+ damage to a single enemy.
Completed Burning Prison.
Used every main character's final strike.
Completed Abh-kamu.
Completed Hunter & Hunted - Part 2.
Completed Hansana Offense & Defense.
Used every main character's co-op chain.
Completed The Daybreakers.
Completed Abandoned Feelings.
Completed Princess of a Fallen Empire.
Completed Pursuit.
Completed Karulawaturei.
Dealt 750+ damage to a single enemy.
Dealt 300+ damage to a single enemy.
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 a free battle.
Tried training.
Completed Decisive Battle.
Completed Imperial Capital Invasion.
Completed Nuwangi.
Completed Tatokori Gate.
Used a final strike.
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.