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