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