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