Here is the full list of all 54 Ys VIII: Lacrimosa of DANA VIII-Lacrimosa of DANA- achievements.
Cleared Chapter 4 - The Lost World.
Witnessed the true ending on Nightmare difficulty or higher.
Thoroughly explored while playing as Hummel.
Achieved 100% Items Collected.
Achieved 100% Beast Entries Logged.
Thoroughly explored while playing as Ricotta.
Defeated Melaiduma at the Former Sanctuary Crypt.
Achieved 100% People Entries Logged.
Achieved 100% Approval Earned.
Cleared Epilogue - End of the Blue Waves, and viewed the true ending.
Cleared Chapter 6 - Lacrimosa of the Distant Sea.
Completed the map of the Isle of Seiren.
Achieved 100% Treasures Found.
Achieved 100% Fish Entries Logged.
Achieved 100% Village Fortifications Built.
Completed every Castaway Village quest.
Performed 100 Flash Guards.
Completed all raids.
Completed all hunts.
Achieved Lv. MAX with every skill.
Cleared all Eternia Quests.
Passed the final trial, and learned the true history of the Kingdom of Eternia.
Achieved 100% Material Entries Logged.
Achieved a Reputation of 200 or more.
Defeated Mephorash at the Silent Tower.
Performed 100 EXTRA Skills.
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.
Performed a Skill Finish 1000 times.
Thoroughly explored while playing as Dana.
Thoroughly explored while playing as Sahad.
Achieved an S Rank in any raid.
Thoroughly explored while playing as Laxia.
Cleared Baja Tower.
Defeated 100 Primordials.
Traveled a total distance of 300 krimelye.
Cleared Chapter 3 - Surpassing Gendarme.
Performed 1000 Breaks.
Defeated 2000 beasts.
Cleared Chapter 2 - The Castaway Banquet.
Performed 100 Flash Moves.
Owned 888 of a single item.
Thoroughly explored while playing as Adol.
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.