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.
Filled out all material details in journal.
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.
Cleared the game on Nightmare difficulty.
Restored all lost memories.
Completed the main story.
Filled out all monster details in journal.
Overcame Gruda's trial.
Opened every treasure chest.
Completed the Map of Celceta.
Discovered every resource point.
Defeated the ruler of the Great Forest.
Successfully completed every quest.
Endured all of Zara's tickle sessions.
Amassed one million gold.
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.
Mastered every skill.
Found all of Mishy's hiding spots.
Cleared all obstructed paths.
Defeated a rare golden foe.
Enhanced a weapon or armor to its limit.
Played extensively as Calilica.
Played extensively as Frieda.
Arrived in the ruined capital, Elduke.
Played extensively as Ozma.
Walked an extraordinary total distance.
Played extensively as Duren.
Played extensively as Karna.
Befriended all animals.
Located the underground village of Danan.
Proved your skill as a merchant.
Reunited with Eldeel at the Tower of Providence.
Achieved five hundred Skill Finishes.
Successfully arrived in the Primeval Lands.
Defeated two thousand enemies.
Achieved one thousand Aerial Combos.
Successfully used Flash Guard fifty times.
Successfully used Flash Move fifty times.
Achieved five hundred Excellent Kills.
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.