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