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