Here is the full list of all 57 Utawarerumono: Mask of Truth achievements.
Listened to all BGM tracks.
Viewed all event visuals.
Entered the Dream Arena.
Completed the ending.
Power does not conform to the shape of its vessel.
Stood together and faced your hardships.
Shocked and appalled by a horrific sight.
Attacked by those who are loyal unto death.
Listened to an unwelcome monologue.
Dealt 1000+ damage to an enemy in one attack.
Finally found what you were looking for.
Learned a crucial secret of a foreign land.
Opened the door to the bird's cage.
Saw your plans come to fruition.
Viewed 500 or more battle callouts.
Rampaged with no regard for those around you.
Dealt 500+ damage to an enemy in one attack.
Finally released your true strength.
Your voice went unheard. A false truth deafens him.
Confessed your sins.
Who is his vengeance truly for?
Had an unexpected reunion.
Experienced heaven and hell.
Proved that best-laid schemes often go awry.
A soldier must resort to underhanded tactics at times.
Used a Co-op Final.
Used a Co-op Attack.
Viewed 100 or more entries in the glossary.
Used a Final Strike.
Learned a man's final wish in a duel to the death.
Witnessed the bond between two sisters.
Played Munechika's Trials.
Encountered one of undying loyalty.
Found the one hiding in shadows.
Settled a long-standing score.
Managed to avert a crisis.
Cast away all mercy for your enemies.
Was accused of something you never did.
Successfully executed criticals 200 times.
Successfully executed a reactive Skill.
Regained your sense for battle.
Successfully executed a critical.
Successfully executed an Action Chain.
Obtained all trophies.
You may never find warmth in this cold place.
Reduced to a mere beast.
You can never go back...
A job well done.
Thank you for coming.
Dealt 5000+ damage to an enemy in one attack.
Summoned shikigami 100 times.
Played Free Battle mode.
Won 20 Mock battles.
Completed all Dream Arena stages.
Used Final Strike with all characters.
Used Co-op Finals with all characters.
Obtained all battle rewards.