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