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.
Unveil all sub-regions of Greece.
Complete Xenia's questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete Markos's questline.
Perform an Overpower Attack with every weapon type.
Defeat Medusa.
Defeat the Cyclops.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Complete the Daughters of Artemis questline.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Complete the Hippokrates questline.
Outwit the Sphinx.
Defeat the Minotaur.
Complete the Olympic questline.
Raise your Bounty to the maximum level.
Upgrade the Adrestia to Legendary Status.
Discover Atlantis and speak with Pythagoras.
Defeat a Mercenary in the Arena.
Cleave a ship while having an all-women crew.
Become Champion of the Arena.
Acquire a Tier 3 active Ability.
Reach Level 50.
Become the first Mercenary.
Complete Episode 6.
Complete Episode 5.
Kill the Leader of any Region with Low Resources, other than Megaris.
Defeat a full cluster of Cultists of Kosmos.
Equip a Legendary Armor set.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 4.
Sink your first Epic Ship.
Complete Episode 3.
Engrave a Legendary Item with a Legendary Effect.
Fully crew the Adrestia with Legendary Lieutenants.
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).
Spend the night with another character.
Complete Episode 2.
Recruit and assign a Legendary NPC for your ship.
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.
Kill 10 enemies using the Rapid Fire ability.
Kill the Makedonian Lion
Acquire the Sword of Kings
Kill all the Ancients in the Order of Dominion in Messenia
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Secure your bloodline
Kill all of the Ancients in the Order of the Storm in Achaia.
Heal by parrying 10 times with the Judgment of the Lion.
Continue the bloodline.
Discover the truth about Darius' past
Kill all the Ancients in the Order of the Hunters in Makedonia
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Fury of the Bloodline Ability.
Set 10 enemy ships on fire.
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 One Really, Really Bad Day
Complete The Show Must Go On.
Complete The Image of Faith
Complete A Poet's Legacy.
Complete A Friend Worth Dying For
Complete Divine Intervention.
Complete A Brother's Seduction
Complete The Daughters of Lalaia
Forge the 3 Legendary Weapons.
Defeat the Hekatonchires.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Defeat all of the Fallen.
Close all Tartaros Rifts.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Kill all Overseers in Elysium.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 1.
Remember who you are.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.