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