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