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