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