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