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.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Complete Markos's questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete Xenia's questline.
Unveil all sub-regions of Greece.
Perform an Overpower Attack with every weapon type.
Fully crew the Adrestia with Legendary Lieutenants.
Upgrade the Adrestia to Legendary Status.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Defeat the Cyclops.
Defeat Medusa.
Defeat the Minotaur.
Equip a Legendary Armor set.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Cleave a ship while having an all-women crew.
Complete the Daughters of Artemis questline.
Reach Level 50.
Engrave a Legendary Item with a Legendary Effect.
Become the first Mercenary.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Acquire a Tier 3 active Ability.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete the Olympic questline.
Complete the Hippokrates questline.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete Episode 6.
Complete Episode 5.
Defeat a full cluster of Cultists of Kosmos.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 4.
Sink your first Epic Ship.
Raise your Bounty to the maximum level.
Complete Episode 3.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Complete Episode 2.
Spend the night with another character.
Acquire and equip your first Legendary item.
Cleave a ship in half.
Upgrade the Adrestia for the first time.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
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.
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Kill 10 enemies using the Rapid Fire ability.
Acquire the Sword of Kings
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
Kill all of the Ancients in the Order of the Storm in Achaia.
Continue the bloodline.
Kill 10 enemies using the Fury of the Bloodline Ability.
Set 10 enemy ships on fire.
Kill all the Ancients in the Order of the Hunters in Makedonia
Discover the truth about Darius' past
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 Divine Intervention.
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Complete A Poet's Legacy.
Complete The Show Must Go On.
Complete The Image of Faith
Forge the 3 Legendary Weapons.
Defeat the Hekatonchires.
Completely fill the Knowledge Sequence.
Collect all the Keeper's Insights in Episode 3.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Dethrone the king.
Close all Tartaros Rifts.
Collect all the Keeper's Insights in Episode 2.
Defeat all of the Fallen.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 1.
Remember who you are.
Kill all Overseers in Elysium.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.