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.
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.
Completed all raids.
Completed every Castaway Village quest.
Achieved 100% Approval Earned.
Completed all hunts.
Achieved 100% Fish Entries Logged.
Achieved 100% Village Fortifications Built.
Achieved 100% Material Entries Logged.
Achieved Lv. MAX with every skill.
Achieved a Reputation of 200 or more.
Defeated Mephorash at the Silent Tower.
Brought all survivors to Castaway Village.
Achieved 100% Location Points Found.
Rescued every spirit in Eternia.
Achieved 100% Meal Entries Logged.
Fully enhanced all weapons.
Cleared Chapter 5 - Maiden of the Great Tree.
Defeated the Oceanus once and for all.
Cleared Baja Tower.
Thoroughly explored while playing as Dana.
Thoroughly explored while playing as Hummel.
Cleared Chapter 4 - The Lost World.
Performed 100 EXTRA Skills.
Defeated 100 Primordials.
Thoroughly explored while playing as Ricotta.
Cleared Chapter 3 - Surpassing Gendarme.
Owned 888 of a single item.
Thoroughly explored while playing as Sahad.
Traveled a total distance of 300 krimelye.
Cleared Chapter 2 - The Castaway Banquet.
Thoroughly explored while playing as Laxia.
Performed 1000 Breaks.
Performed a Skill Finish 1000 times.
Made it through the Eroded Valley.
Defeated 2000 beasts.
Thoroughly explored while playing as Adol.
Performed 100 Flash Guards.
Performed 100 Flash Moves.
Made it through the Towering Coral Forest.
Achieved an S Rank in any raid.
Enhanced a weapon to Lv. MAX.
Cleared Chapter 1 - The Isle of Seiren.
Cleared Prologue - Night on the Gaete Sea.
Began a new adventure.