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