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