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