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