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