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