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.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Complete Episode 7.
Complete the Olympic questline.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete the Hippokrates questline.
Complete Xenia's questline.
Complete Episode 6.
Complete Episode 5.
Complete all underwater location objectives.
Complete Episode 4.
Become Champion of the Arena.
Defeat a Mercenary in the Arena.
Unveil all sub-regions of Greece.
Defeat Medusa.
Complete the Daughters of Artemis questline.
Complete Markos's questline.
Upgrade the Adrestia to Legendary Status.
Defeat a full cluster of Cultists of Kosmos.
Fully crew the Adrestia with Legendary Lieutenants.
Engrave a Legendary Item with a Legendary Effect.
Reach Level 50.
Acquire a Tier 3 active Ability.
Become the first Mercenary.
Defeat the Minotaur.
Equip a Legendary Armor set.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Defeat the Cyclops.
Perform an Overpower Attack with every weapon type.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Raise your Bounty to the maximum level.
Complete Episode 3.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Sink your first Epic Ship.
Kill the Leader of any Region with Low Resources, other than Megaris.
Recover the Cyclops's eye from a goat on Kephallonia.
Acquire and equip your first Legendary item.
Complete Episode 2.
Engrave your first item.
Spend the night with another character.
Upgrade the Adrestia for the first time.
Cleave a ship while having an all-women crew.
Recruit and assign a Legendary NPC for your ship.
Cleave a ship in half.
Complete Episode 1.
Complete the Battle of 300.
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Acquire the Sword of Kings
Secure your bloodline
Kill all the Ancients in the Order of Dominion in Messenia
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.
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
Kill 10 enemies using the Death Veil ability
Complete The Heir of Memories
Complete Old Flames Burn Brighter
Complete A Friend Worth Dying For
Complete One Really, Really Bad Day
Complete Every Story Has an Ending
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.
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.
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.