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