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