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.
Complete the Hippokrates questline.
Complete Xenia's questline.
Complete Markos's questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Unveil all sub-regions of Greece.
Upgrade the Adrestia to Legendary Status.
Perform an Overpower Attack with every weapon type.
Defeat all the Cultists of Kosmos.
Upgrade your Spear to Tier 6.
Become Champion of the Arena.
Cleave a ship while having an all-women crew.
Reach Level 50.
Complete the Daughters of Artemis questline.
Defeat Medusa.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat the Cyclops.
Outwit the Sphinx.
Become the first Mercenary.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete Episode 8.
Complete Episode 9 + Epilogue.
Engrave a Legendary Item with a Legendary Effect.
Complete Episode 7.
Defeat the Minotaur.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Equip a Legendary Armor set.
Recruit and assign a Legendary NPC for your ship.
Acquire a Tier 3 active Ability.
Complete the Olympic questline.
Defeat a Mercenary in the Arena.
Discover Atlantis and speak with Pythagoras.
Defeat a full cluster of Cultists of Kosmos.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 6.
Complete Episode 5.
Sink your first Epic Ship.
Raise your Bounty to the maximum level.
Complete Episode 4.
Complete Episode 3.
Spend the night with another character.
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 2.
Acquire and equip your first Legendary item.
Upgrade the Adrestia for the first time.
Complete Episode 1.
Engrave your first item.
Cleave a ship in half.
Complete the Battle of 300.
Heal by parrying 10 times with the Judgment of the Lion.
Set 10 enemy ships on fire.
Kill the Makedonian Lion
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Kill all of the Ancients in the Order of the Storm in Achaia.
Acquire the Sword of Kings
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
Continue the bloodline.
Discover the truth about Darius' past
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
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Complete Every Story Has an Ending
Complete A Friend Worth Dying For
Complete The Show Must Go On.
Complete Old Flames Burn Brighter
Complete A Poet's Legacy.
Complete The Image of Faith
Complete Divine Intervention.
Complete The Daughters of Lalaia
Complete One Really, Really Bad Day
Complete A Brother's Seduction
Complete The Heir of Memories
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Completely fill the Knowledge Sequence.
Close all Tartaros Rifts.
Defeat all of the Fallen.
Destroy all of the Marble Maiden Tributes.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Collect all the Keeper's Insights in Episode 1.
Remember who you are.
Kill all Overseers in Elysium.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.