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