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