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