Here is the full list of all 52 Ys: Memories of Celceta achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Acquired all achievements.
Played extensively as Frieda.
Played extensively as Calilica.
Conquered Boss Rush.
Conquered Boss Rush without a single retry.
Cleared the game on Nightmare difficulty.
Filled out all monster details in journal.
Defeated a boss in Time Attack in thirty seconds or less.
Defeated a boss in Time Attack without taking damage.
Mastered every skill.
Acquired at least one of every item.
Filled out all material details in journal.
Played extensively as Ozma.
Enhanced a weapon or armor to its limit.
Amassed one million gold.
Opened every treasure chest.
Completed the Map of Celceta.
Played extensively as Karna.
Played extensively as Duren.
Discovered every resource point.
Defeated the ruler of the Great Forest.
Befriended all animals.
Endured all of Zara's tickle sessions.
Found all of Mishy's hiding spots.
Cleared all obstructed paths.
Restored all lost memories.
Completed the main story.
Overcame Gruda's trial.
Opened the door to the Temple of the Sun.
Successfully completed every quest.
Purchased every piece of info from Mouse.
Acquired both halves of the Mask of the Moon.
Arrived in the ruined capital, Elduke.
Walked an extraordinary total distance.
Located the underground village of Danan.
Defeated two thousand enemies.
Proved your skill as a merchant.
Defeated a rare golden foe.
Reunited with Eldeel at the Tower of Providence.
Successfully used Flash Guard fifty times.
Successfully arrived in the Primeval Lands.
Played extensively as Adol.
Resolved the polluted river dilemma.
Achieved one thousand Aerial Combos.
Achieved five hundred Excellent Kills.
Achieved five hundred Skill Finishes.
Solved the mystery of the missing villagers.
Defeated Duren in one-on-one combat.
Discovered a settlement in the Great Forest.
Successfully used Flash Move fifty times.
Successfully rescued the trapped miners.
Began your adventure in Celceta.