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