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