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 Medusa.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete the Daughters of Artemis questline.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Upgrade the Adrestia to Legendary Status.
Defeat the Cyclops.
Defeat the Minotaur.
Cleave a ship while having an all-women crew.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Engrave a Legendary Item with a Legendary Effect.
Reach Level 50.
Become the first Mercenary.
Become Champion of the Arena.
Complete Episode 7.
Perform an Overpower Attack with every weapon type.
Complete the Olympic questline.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Defeat a Mercenary in the Arena.
Complete Episode 6.
Raise your Bounty to the maximum level.
Complete Episode 5.
Engrave your first item.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 4.
Fully crew the Adrestia with Legendary Lieutenants.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Complete Episode 3.
Sink your first Epic Ship.
Spend the night with another character.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Cleave a ship in half.
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.
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 Quests on Pephka, Obsidian and Abantis islands.
Kill the Makedonian Lion
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.
Set 10 enemy ships on fire.
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
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 A Poet's Legacy.
Complete A Friend Worth Dying For
Complete One Really, Really Bad Day
Complete The Image of Faith
Complete Old Flames Burn Brighter
Complete Divine Intervention.
Complete The Daughters of Lalaia
Complete A Brother's Seduction
Complete The Show Must Go On.
Destroy all of the Marble Maiden Tributes.
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
Dethrone the king.
Close all Tartaros Rifts.
Defeat all of the Fallen.
Collect all the Keeper's Insights in Episode 2.
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.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.