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