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