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