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.
Complete the Hippokrates questline.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Outwit the Sphinx.
Complete all underwater location objectives.
Unveil all sub-regions of Greece.
Defeat Medusa.
Complete the Daughters of Artemis questline.
Complete the Olympic questline.
Defeat the Cyclops.
Defeat the Minotaur.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Discover Atlantis and speak with Pythagoras.
Complete Markos's questline.
Complete Episode 6.
Complete Episode 5.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Upgrade the Adrestia to Legendary Status.
Fully crew the Adrestia with Legendary Lieutenants.
Acquire a Tier 3 active Ability.
Equip a Legendary Armor set.
Defeat a full cluster of Cultists of Kosmos.
Reach Level 50.
Become the first Mercenary.
Perform an Overpower Attack with every weapon type.
Complete Episode 4.
Engrave a Legendary Item with a Legendary Effect.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete Episode 3.
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.
Sink your first Epic Ship.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Spend the night with another character.
Raise your Bounty to the maximum level.
Acquire and equip your first Legendary item.
Recover the Cyclops's eye from a goat on Kephallonia.
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.
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
Secure your bloodline
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.
Kill all the Ancients in the Order of the Hunters in Makedonia
Discover the truth about Darius' past
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.
Set 10 enemy ships on fire.
Kill 10 enemies using the Fury of the Bloodline Ability.
Kill 10 enemies using the Death Veil ability
Complete The Heir of Memories
Complete Every Story Has an Ending
Complete A Friend Worth Dying For
Complete The Show Must Go On.
Complete The Image of Faith
Complete Old Flames Burn Brighter
Complete Divine Intervention.
Complete A Brother's Seduction
Complete A Poet's Legacy.
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
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.
Win the conquest of Elysium with freed humans from the 3 main regions.
Defeat Cerberos.
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.