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