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