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