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