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.
Upgrade the Adrestia to Legendary Status.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Reach Level 50.
Become Champion of the Arena.
Defeat Medusa.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Become the first Mercenary.
Complete Markos's questline.
Complete the Hippokrates questline.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Defeat the Minotaur.
Cleave a ship while having an all-women crew.
Defeat the Cyclops.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Complete the Daughters of Artemis questline.
Complete Episode 7.
Outwit the Sphinx.
Complete the Olympic questline.
Perform an Overpower Attack with every weapon type.
Acquire a Tier 3 active Ability.
Equip a Legendary Armor set.
Defeat a full cluster of Cultists of Kosmos.
Recover the Cyclops's eye from a goat on Kephallonia.
Discover Atlantis and speak with Pythagoras.
Defeat a Mercenary in the Arena.
Kill the Leader of any Region with Low Resources, other than Megaris.
Engrave a Legendary Item with a Legendary Effect.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 6.
Complete Episode 5.
Raise your Bounty to the maximum level.
Complete Episode 4.
Spend the night with another character.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Sink your first Epic Ship.
Complete Episode 3.
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
Acquire and equip your first Legendary item.
Complete Episode 2.
Engrave your first item.
Cleave a ship in half.
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
Set 10 enemy ships on fire.
Kill 10 enemies using the Rapid Fire ability.
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.
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Death Veil ability
Kill all the Ancients in the Order of the Hunters in Makedonia
Discover the truth about Darius' past
Kill the Makedonian 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 Divine Intervention.
Complete The Show Must Go On.
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.
Defeat all of the Fallen.
Close all Tartaros Rifts.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Defeat Cerberos.
Destroy all of the Marble Maiden Tributes.
Win the conquest of Elysium with freed humans from the 3 main regions.
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.