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