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