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