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