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