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