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 Xenia's questline.
Unveil all sub-regions of Greece.
Complete all underwater location objectives.
Complete the Hippokrates questline.
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 Medusa.
Complete the Daughters of Artemis questline.
Defeat the Minotaur.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Become Champion of the Arena.
Defeat a Mercenary in the Arena.
Defeat the Cyclops.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete Episode 6.
Complete Episode 5.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Upgrade the Adrestia to Legendary Status.
Complete Markos's questline.
Complete Episode 4.
Recover the Cyclops's eye from a goat on Kephallonia.
Engrave a Legendary Item with a Legendary Effect.
Fully crew the Adrestia with Legendary Lieutenants.
Become the first Mercenary.
Reach Level 50.
Perform an Overpower Attack with every weapon type.
Sink your first Epic Ship.
Cleave a ship in half.
Cleave a ship while having an all-women crew.
Complete Episode 3.
Complete Episode 2.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Spend the night with another character.
Kill the Leader of any Region with Low Resources, other than Megaris.
Raise your Bounty to the maximum level.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 1.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Engrave your first item.
Equip a Legendary Armor set.
Acquire and equip your first Legendary item.
Complete the Battle of 300.
Acquire the Sword of Kings
Secure your bloodline
Kill all the Ancients in the Order of Dominion in Messenia
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.
Set 10 enemy ships on fire.
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
Kill the Makedonian Lion
Kill 10 enemies using the Rapid Fire ability.
Kill 10 enemies using the Fury of the Bloodline Ability.
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 Poet's Legacy.
Complete The Show Must Go On.
Complete The Image of Faith
Complete Divine Intervention.
Complete A Brother's Seduction
Complete The Daughters of Lalaia
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.
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.
Destroy all of the Marble Maiden Tributes.
Kill all Overseers in Elysium.
Remember who you are.
Collect all the Keeper's Insights in Episode 1.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.