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 Episode 9 + Epilogue.
Defeat all the Cultists of Kosmos.
Complete Xenia's questline.
Unveil all sub-regions of Greece.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Become the first Mercenary.
Complete Episode 7.
Complete all underwater location objectives.
Defeat Medusa.
Complete the Daughters of Artemis questline.
Defeat the Minotaur.
Upgrade the Adrestia to Legendary Status.
Become Champion of the Arena.
Defeat a Mercenary in the Arena.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Outwit the Sphinx.
Complete the Hippokrates questline.
Complete the Olympic questline.
Defeat the Cyclops.
Reach Level 50.
Recover the Cyclops's eye from a goat on Kephallonia.
Discover Atlantis and speak with Pythagoras.
Complete Markos's questline.
Acquire a Tier 3 active Ability.
Complete Episode 6.
Complete Episode 5.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Perform an Overpower Attack with every weapon type.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat a full cluster of Cultists of Kosmos.
Equip a Legendary Armor set.
Complete Episode 4.
Raise your Bounty to the maximum level.
Sink your first Epic Ship.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Engrave a Legendary Item with a Legendary Effect.
Cleave a ship while having an all-women crew.
Complete Episode 3.
Kill the Leader of any Region with Low Resources, other than Megaris.
Cleave a ship in half.
Spend the night with another character.
Acquire and equip your first Legendary item.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
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
Kill 10 enemies using the Fury of the Bloodline Ability.
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.
Set 10 enemy ships on fire.
Kill 10 enemies using the Rapid Fire ability.
Kill the Makedonian Lion
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 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.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
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.
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 Arges, the Bright One
Defeat Steropes the Lightning Bringer.