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