Here is the full list of all 54 Ys VIII: Lacrimosa of DANA VIII-Lacrimosa of DANA- achievements.
Witnessed the true ending on Nightmare difficulty or higher.
Thoroughly explored while playing as Laxia.
Thoroughly explored while playing as Sahad.
Thoroughly explored while playing as Hummel.
Thoroughly explored while playing as Ricotta.
Completed all hunts.
Defeated Melaiduma at the Former Sanctuary Crypt.
Cleared Epilogue - End of the Blue Waves, and viewed the true ending.
Achieved 100% People Entries Logged.
Achieved 100% Beast Entries Logged.
Cleared Chapter 6 - Lacrimosa of the Distant Sea.
Achieved 100% Items Collected.
Completed the map of the Isle of Seiren.
Achieved 100% Treasures Found.
Passed the final trial, and learned the true history of the Kingdom of Eternia.
Cleared all Eternia Quests.
Defeated Mephorash at the Silent Tower.
Achieved 100% Approval Earned.
Achieved 100% Fish Entries Logged.
Completed every Castaway Village quest.
Achieved Lv. MAX with every skill.
Completed all raids.
Achieved 100% Village Fortifications Built.
Enhanced a weapon to Lv. MAX.
Thoroughly explored while playing as Adol.
Achieved 100% Meal Entries Logged.
Achieved 100% Material Entries Logged.
Thoroughly explored while playing as Dana.
Achieved a Reputation of 200 or more.
Fully enhanced all weapons.
Brought all survivors to Castaway Village.
Achieved 100% Location Points Found.
Owned 888 of a single item.
Rescued every spirit in Eternia.
Cleared Chapter 5 - Maiden of the Great Tree.
Performed 100 EXTRA Skills.
Defeated the Oceanus once and for all.
Performed 100 Flash Guards.
Traveled a total distance of 300 krimelye.
Cleared Chapter 4 - The Lost World.
Cleared Baja Tower.
Defeated 100 Primordials.
Performed a Skill Finish 1000 times.
Cleared Chapter 3 - Surpassing Gendarme.
Performed 100 Flash Moves.
Performed 1000 Breaks.
Cleared Chapter 2 - The Castaway Banquet.
Achieved an S Rank in any raid.
Defeated 2000 beasts.
Made it through the Eroded Valley.
Made it through the Towering Coral Forest.
Cleared Chapter 1 - The Isle of Seiren.
Cleared Prologue - Night on the Gaete Sea.
Began a new adventure.