Full list of all 93 Assassin's Creed Odyssey achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 5 DLC packs containing 43 achievements.
Unveil all sub-regions of Greece.
Complete all underwater location objectives.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Upgrade the Adrestia to Legendary Status.
Complete Xenia's questline.
Complete the Hippokrates questline.
Complete Markos's questline.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete the Daughters of Artemis questline.
Cleave a ship while having an all-women crew.
Recover the Cyclops's eye from a goat on Kephallonia.
Perform an Overpower Attack with every weapon type.
Become Champion of the Arena.
Become the first Mercenary.
Raise your Bounty to the maximum level.
Defeat Medusa.
Defeat all the Cultists of Kosmos.
Engrave a Legendary Item with a Legendary Effect.
Reach Level 50.
Upgrade your Spear to Tier 6.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat a Mercenary in the Arena.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Defeat the Minotaur.
Defeat the Cyclops.
Complete the Olympic questline.
Acquire a Tier 3 active Ability.
Outwit the Sphinx.
Defeat a full cluster of Cultists of Kosmos.
Discover Atlantis and speak with Pythagoras.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 6.
Complete Episode 5.
Complete Episode 4.
Sink your first Epic Ship.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Recruit and assign a Legendary NPC for your ship.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Equip a Legendary Armor set.
Spend the night with another character.
Complete Episode 3.
Acquire and equip your first Legendary item.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Cleave a ship in half.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Kill 10 enemies using the Rapid Fire ability.
Heal by parrying 10 times with the Judgment of the Lion.
Kill the Makedonian Lion
Kill 10 enemies using the Fury of the Bloodline Ability.
Acquire the Sword of Kings
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Continue the bloodline.
Kill all of the Ancients in the Order of the Storm in Achaia.
Kill all the Ancients in the Order of the Hunters in Makedonia
Discover the truth about Darius' past
Set 10 enemy ships on fire.
Kill 10 enemies using the Death Veil ability
Complete The Daughters of Lalaia
Complete A Friend Worth Dying For
Complete Old Flames Burn Brighter
Complete A Brother's Seduction
Complete Divine Intervention.
Complete One Really, Really Bad Day
Complete A Poet's Legacy.
Complete Every Story Has an Ending
Complete The Show Must Go On.
Complete The Image of Faith
Complete The Heir of Memories
Close all Tartaros Rifts.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Forge the 3 Legendary Weapons.
Destroy all of the Marble Maiden Tributes.
Defeat the Hekatonchires.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Defeat all of the Fallen.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Kill all Overseers in Elysium.
Remember who you are.
Collect all the Keeper's Insights in Episode 1.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.