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 the Olympic questline.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Discover Atlantis and speak with Pythagoras.
Upgrade the Adrestia to Legendary Status.
Complete Markos's questline.
Become Champion of the Arena.
Defeat a full cluster of Cultists of Kosmos.
Complete Episode 6.
Complete Episode 5.
Acquire a Tier 3 active Ability.
Reach Level 50.
Become the first Mercenary.
Defeat the Minotaur.
Defeat a Mercenary in the Arena.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Raise your Bounty to the maximum level.
Complete Episode 4.
Fully crew the Adrestia with Legendary Lieutenants.
Recruit and assign a Legendary NPC for your ship.
Engrave a Legendary Item with a Legendary Effect.
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.
Perform an Overpower Attack with every weapon type.
Sink your first Epic Ship.
Complete Episode 3.
Upgrade the Adrestia for the first time.
Complete Episode 2.
Spend the night with another character.
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.
Complete Episode 7.
Complete Episode 8.
Complete Episode 9 + Epilogue.
Complete all underwater location objectives.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Recover the Cyclops's eye from a goat on Kephallonia.
Unveil all sub-regions of Greece.
Defeat Medusa.
Defeat the Cyclops.
Outwit the Sphinx.
Complete the Daughters of Artemis questline.
Complete the Hippokrates questline.
Complete Xenia's questline.
Cleave a ship while having an all-women crew.
Set 10 enemy ships on fire.
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
Kill the Makedonian Lion
Discover the truth about Darius' past
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill all the Ancients in the Order of the Hunters in Makedonia
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.
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 A Friend Worth Dying For
Complete The Show Must Go On.
Complete The Image of Faith
Complete A Brother's Seduction
Complete A Poet's Legacy.
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Complete Divine Intervention.
Complete The Heir of Memories
Complete Every Story Has an Ending
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.