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