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