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.
Upgrade the Adrestia to Legendary Status.
Defeat Medusa.
Outwit the Sphinx.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Defeat the Cyclops.
Reach Level 50.
Become Champion of the Arena.
Complete Episode 9 + Epilogue.
Become the first Mercenary.
Complete Episode 8.
Fully crew the Adrestia with Legendary Lieutenants.
Cleave a ship while having an all-women crew.
Defeat the Minotaur.
Complete the Daughters of Artemis questline.
Raise your Bounty to the maximum level.
Complete Episode 7.
Defeat a Mercenary in the Arena.
Complete the Olympic questline.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Discover Atlantis and speak with Pythagoras.
Complete Episode 6.
Complete Episode 5.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 4.
Sink your first Epic Ship.
Complete Episode 3.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Spend the night with another character.
Cleave a ship in half.
Engrave your first item.
Engrave a Legendary Item with a Legendary Effect.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 1.
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 all underwater location objectives.
Recover the Cyclops's eye from a goat on Kephallonia.
Unveil all sub-regions of Greece.
Complete Markos's questline.
Complete the Hippokrates questline.
Complete Xenia's questline.
Perform an Overpower Attack with every weapon type.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Acquire the Sword of Kings
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
Heal by parrying 10 times with the Judgment of the Lion.
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
Kill the Makedonian Lion
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Fury of the Bloodline Ability.
Kill 10 enemies using the Death Veil ability
Kill 10 enemies using the Rapid Fire ability.
Set 10 enemy ships on fire.
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Complete The Heir of Memories
Complete Every Story Has an Ending
Complete Divine Intervention.
Complete One Really, Really Bad Day
Complete A Friend Worth Dying For
Complete The Daughters of Lalaia
Complete A Brother's Seduction
Complete The Show Must Go On.
Complete The Image of Faith
Complete A Poet's Legacy.
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 Steropes the Lightning Bringer.
Defeat Arges, the Bright One