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.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete Xenia's questline.
Complete the Hippokrates questline.
Complete Markos's questline.
Unveil all sub-regions of Greece.
Complete all underwater location objectives.
Perform an Overpower Attack with every weapon type.
Upgrade the Adrestia to Legendary Status.
Engrave a Legendary Item with a Legendary Effect.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Defeat Medusa.
Upgrade your Spear to Tier 6.
Reach Level 50.
Defeat all the Cultists of Kosmos.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Become Champion of the Arena.
Complete the Daughters of Artemis questline.
Become the first Mercenary.
Defeat the Minotaur.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Defeat a full cluster of Cultists of Kosmos.
Complete the Olympic questline.
Defeat the Cyclops.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Acquire a Tier 3 active Ability.
Complete Episode 6.
Complete Episode 5.
Complete Episode 4.
Defeat a Mercenary in the Arena.
Raise your Bounty to the maximum level.
Sink your first Epic Ship.
Complete Episode 3.
Spend the night with another character.
Engrave your first item.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 2.
Upgrade the Adrestia for the first time.
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.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Equip a Legendary Armor set.
Acquire and equip your first Legendary 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.
Acquire the Sword of Kings
Secure your bloodline
Kill all the Ancients in the Order of Dominion in Messenia
Kill 10 enemies using the Rapid Fire ability.
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.
Set 10 enemy ships on fire.
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
Kill the Makedonian Lion
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 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.
Complete The Heir of Memories
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Completely fill the Knowledge Sequence.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
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.
Kill all Overseers in Elysium.
Remember who you are.
Collect all the Keeper's Insights in Episode 1.
Destroy all of the Marble Maiden Tributes.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.