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