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 the Hippokrates questline.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Perform an Overpower Attack with every weapon type.
Complete Xenia's questline.
Complete Markos's questline.
Complete the Daughters of Artemis questline.
Defeat the Cyclops.
Defeat Medusa.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Unveil all sub-regions of Greece.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Defeat the Minotaur.
Become the first Mercenary.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Complete all underwater location objectives.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Defeat a full cluster of Cultists of Kosmos.
Acquire a Tier 3 active Ability.
Complete the Olympic questline.
Complete Episode 6.
Complete Episode 5.
Complete Episode 4.
Raise your Bounty to the maximum level.
Engrave a Legendary Item with a Legendary Effect.
Sink your first Epic Ship.
Kill the Leader of any Region with Low Resources, other than Megaris.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Episode 3.
Reach Level 50.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Complete Episode 2.
Spend the night with another character.
Cleave a ship in half.
Cleave a ship while having an all-women crew.
Upgrade the Adrestia to Legendary Status.
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 1.
Recover the Cyclops's eye from a goat on Kephallonia.
Engrave your first item.
Equip a Legendary Armor set.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Acquire and equip your first Legendary item.
Complete the Battle of 300.
Kill 10 enemies using the Rapid Fire ability.
Acquire the Sword of Kings
Secure your bloodline
Kill all the Ancients in the Order of Dominion in Messenia
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Kill 10 enemies using the Fury of the Bloodline Ability.
Heal by parrying 10 times with the Judgment of the Lion.
Kill all of the Ancients in the Order of the Storm in Achaia.
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill the Makedonian Lion
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Continue the bloodline.
Discover the truth about Darius' past
Set 10 enemy ships on fire.
Kill 10 enemies using the Death Veil ability
Complete The Image of Faith
Complete The Heir of Memories
Complete Every Story Has an Ending
Complete A Brother's Seduction
Complete A Poet's Legacy.
Complete Old Flames Burn Brighter
Complete A Friend Worth Dying For
Complete Divine Intervention.
Complete The Show Must Go On.
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Completely fill the Knowledge Sequence.
Collect all the Keeper's Insights in Episode 3.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Close all Tartaros Rifts.
Defeat all of the Fallen.
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.