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.
Thoroughly explored while playing as Hummel.
Thoroughly explored while playing as Ricotta.
Performed 100 Flash Guards.
Achieved Lv. MAX with every skill.
Achieved 100% Items Collected.
Achieved 100% Village Fortifications Built.
Achieved 100% Approval Earned.
Completed the map of the Isle of Seiren.
Achieved 100% Treasures Found.
Thoroughly explored while playing as Sahad.
Completed every Castaway Village quest.
Passed the final trial, and learned the true history of the Kingdom of Eternia.
Cleared all Eternia Quests.
Thoroughly explored while playing as Dana.
Completed all hunts.
Achieved 100% Fish Entries Logged.
Thoroughly explored while playing as Laxia.
Performed a Skill Finish 1000 times.
Achieved 100% Material Entries Logged.
Performed 100 EXTRA Skills.
Completed all raids.
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.
Cleared Chapter 5 - Maiden of the Great Tree.
Fully enhanced all weapons.
Performed 100 Flash Moves.
Defeated the Oceanus once and for all.
Achieved an S Rank in any raid.
Cleared Baja Tower.
Traveled a total distance of 300 krimelye.
Defeated 100 Primordials.
Cleared Chapter 4 - The Lost World.
Cleared Chapter 3 - Surpassing Gendarme.
Thoroughly explored while playing as Adol.
Performed 1000 Breaks.
Cleared Chapter 2 - The Castaway Banquet.
Defeated 2000 beasts.
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.