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