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.
Complete all underwater location objectives.
Unveil all sub-regions of Greece.
Complete Xenia's questline.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Defeat Medusa.
Complete the Daughters of Artemis questline.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Complete Markos's questline.
Defeat the Minotaur.
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Complete the Hippokrates questline.
Equip a Legendary Armor set.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete Episode 7.
Upgrade the Adrestia to Legendary Status.
Defeat the Cyclops.
Complete the Olympic questline.
Outwit the Sphinx.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Become the first Mercenary.
Reach Level 50.
Discover Atlantis and speak with Pythagoras.
Engrave a Legendary Item with a Legendary Effect.
Complete Episode 6.
Complete Episode 5.
Fully crew the Adrestia with Legendary Lieutenants.
Cleave a ship while having an all-women crew.
Complete Episode 4.
Perform an Overpower Attack with every weapon type.
Raise your Bounty to the maximum level.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Sink your first Epic Ship.
Complete Episode 3.
Kill the Leader of any Region with Low Resources, other than Megaris.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Recruit and assign a Legendary NPC for your ship.
Upgrade the Adrestia for the first time.
Complete Episode 2.
Spend the night with another character.
Acquire and equip your first Legendary item.
Cleave a ship in half.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
Kill the Makedonian Lion
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.
Set 10 enemy ships on fire.
Kill 10 enemies using the Fury of the Bloodline Ability.
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.
Discover the truth about Darius' past
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill 10 enemies using the Rapid Fire ability.
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Death Veil ability
Complete Old Flames Burn Brighter
Complete A Friend Worth Dying For
Complete Divine Intervention.
Complete A Brother's Seduction
Complete Every Story Has an Ending
Complete One Really, Really Bad Day
Complete The Daughters of Lalaia
Complete The Heir of Memories
Complete A Poet's Legacy.
Complete The Image of Faith
Complete The Show Must Go On.
Destroy all of the Marble Maiden Tributes.
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.
Kill all Overseers in Elysium.
Remember who you are.
Collect all the Keeper's Insights in Episode 1.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.