Here is the full list of all 57 Utawarerumono: Mask of Truth achievements.
You can never go back...
Reduced to a mere beast.
You may never find warmth in this cold place.
Entered the Dream Arena.
Listened to all BGM tracks.
Completed the ending.
Viewed all event visuals.
Used Final Strike with all characters.
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.
Summoned shikigami 100 times.
Listened to an unwelcome monologue.
Finally found what you were looking for.
Learned a crucial secret of a foreign land.
Won 20 Mock battles.
Opened the door to the bird's cage.
Saw your plans come to fruition.
Dealt 1000+ damage to an enemy in one attack.
Rampaged with no regard for those around you.
Finally released your true strength.
Your voice went unheard. A false truth deafens him.
Viewed 500 or more battle callouts.
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.
Used a Co-op Final.
A soldier must resort to underhanded tactics at times.
Used a Co-op Attack.
Dealt 500+ damage to an enemy in one attack.
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.
Used a Final Strike.
Found the one hiding in shadows.
Settled a long-standing score.
Managed to avert a crisis.
Cast away all mercy for your enemies.
Successfully executed criticals 200 times.
Played Free Battle mode.
Viewed 100 or more entries in the glossary.
Was accused of something you never did.
Successfully executed a reactive Skill.
Regained your sense for battle.
Successfully executed an Action Chain.
Successfully executed a critical.
Obtained all trophies.
A job well done.
Thank you for coming.
Dealt 5000+ damage to an enemy in one attack.
Completed all Dream Arena stages.
Used Co-op Finals with all characters.
Obtained all battle rewards.