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 20 Quests on Pephka, Obsidian and Abantis islands.
Complete the Hippokrates questline.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Outwit the Sphinx.
Defeat Medusa.
Defeat the Cyclops.
Unveil all sub-regions of Greece.
Complete all underwater location objectives.
Upgrade the Adrestia to Legendary Status.
Discover Atlantis and speak with Pythagoras.
Defeat a full cluster of Cultists of Kosmos.
Complete Markos's questline.
Become Champion of the Arena.
Reach Level 50.
Acquire a Tier 3 active Ability.
Complete the Daughters of Artemis questline.
Cleave a ship while having an all-women crew.
Defeat the Minotaur.
Defeat a Mercenary in the Arena.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Become the first Mercenary.
Complete Episode 7.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete Episode 6.
Complete Episode 5.
Fully crew the Adrestia with Legendary Lieutenants.
Perform an Overpower Attack with every weapon type.
Engrave a Legendary Item with a Legendary Effect.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 4.
Complete the Olympic questline.
Sink your first Epic Ship.
Raise your Bounty to the maximum level.
Cleave a ship in half.
Complete Episode 3.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Equip a Legendary Armor set.
Complete Episode 2.
Spend the night with another character.
Acquire and equip your first Legendary item.
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
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
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.
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 Every Story Has an Ending
Complete The Heir of Memories
Complete One Really, Really Bad Day
Complete Old Flames Burn Brighter
Complete A Poet's Legacy.
Complete Divine Intervention.
Complete A Friend Worth Dying For
Complete The Daughters of Lalaia
Complete The Image of Faith
Complete The Show Must Go On.
Complete A Brother's Seduction
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.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Remember who you are.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 1.
Kill all Overseers in Elysium.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.