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