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.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Complete the Daughters of Artemis questline.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Complete the Olympic questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete all underwater location objectives.
Complete the Hippokrates questline.
Unveil all sub-regions of Greece.
Complete Xenia's questline.
Defeat the Cyclops.
Outwit the Sphinx.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Defeat the Minotaur.
Discover Atlantis and speak with Pythagoras.
Complete Markos's questline.
Become the first Mercenary.
Defeat Medusa.
Upgrade the Adrestia to Legendary Status.
Equip a Legendary Armor set.
Reach Level 50.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Complete Episode 6.
Complete Episode 5.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Fully crew the Adrestia with Legendary Lieutenants.
Engrave a Legendary Item with a Legendary Effect.
Complete Episode 4.
Sink your first Epic Ship.
Cleave a ship while having an all-women crew.
Raise your Bounty to the maximum level.
Recruit and assign a Legendary NPC for your ship.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Perform an Overpower Attack with every weapon type.
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.
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.
Engrave your first item.
Complete the Battle of 300.
Land a Rush Assassinate that chains 4 times with the Blade of the 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
Heal by parrying 10 times with the Judgment of the Lion.
Kill the Makedonian 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
Kill 10 enemies using the Fury of the Bloodline Ability.
Kill 10 enemies using the Rapid Fire ability.
Kill 10 enemies using the Death Veil ability
Complete Old Flames Burn Brighter
Complete Every Story Has an Ending
Complete The Heir of Memories
Complete The Daughters of Lalaia
Complete One Really, Really Bad Day
Complete A Poet's Legacy.
Complete A Brother's Seduction
Complete The Image of Faith
Complete A Friend Worth Dying For
Complete Divine Intervention.
Complete The Show Must Go On.
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.
Defeat all of the Fallen.
Collect all the Keeper's Insights in Episode 2.
Close all Tartaros Rifts.
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.