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 Episode 9 + Epilogue.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Complete Episode 7.
Complete Xenia's questline.
Complete the Hippokrates questline.
Complete the Olympic questline.
Complete all underwater location objectives.
Complete the Daughters of Artemis questline.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Defeat Medusa.
Complete Episode 6.
Complete Episode 5.
Equip a Legendary Armor set.
Defeat a full cluster of Cultists of Kosmos.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Upgrade the Adrestia to Legendary Status.
Defeat the Cyclops.
Defeat the Minotaur.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Acquire a Tier 3 active Ability.
Complete Markos's questline.
Reach Level 50.
Become the first Mercenary.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Episode 4.
Raise your Bounty to the maximum level.
Engrave a Legendary Item with a Legendary Effect.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 3.
Kill the Leader of any Region with Low Resources, other than Megaris.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Recruit and assign a Legendary NPC for your ship.
Complete Episode 2.
Spend the night with another character.
Upgrade the Adrestia for the first time.
Acquire and equip your first Legendary item.
Sink your first Epic Ship.
Cleave a ship in half.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
Recover the Cyclops's eye from a goat on Kephallonia.
Unveil all sub-regions of Greece.
Perform an Overpower Attack with every weapon type.
Cleave a ship while having an all-women crew.
Kill all of the Ancients in the Order of the Storm in Achaia.
Continue the bloodline.
Kill all the Ancients in the Order of the Hunters in Makedonia
Discover the truth about Darius' past
Set 10 enemy ships on fire.
Kill 10 enemies using the Death Veil ability
Kill the Makedonian Lion
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Rapid Fire ability.
Heal by parrying 10 times with the Judgment of the Lion.
Kill 10 enemies using the Fury of the Bloodline Ability.
Secure your bloodline
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
Complete Every Story Has an Ending
Complete The Heir of Memories
Complete The Show Must Go On.
Complete The Image of Faith
Complete Divine Intervention.
Complete A Brother's Seduction
Complete A Friend Worth Dying For
Complete A Poet's Legacy.
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Complete Old Flames Burn Brighter
Kill all Overseers in Elysium.
Remember who you are.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 1.
Win the conquest of Elysium with freed humans from the 3 main regions.
Defeat Cerberos.
Close all Tartaros Rifts.
Defeat all of the Fallen.
Collect all the Keeper's Insights in Episode 2.
Dethrone the king.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Completely fill the Knowledge Sequence.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Defeat the Hekatonchires.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.