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