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