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 20 Quests on Pephka, Obsidian and Abantis islands.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete the Hippokrates questline.
Complete Markos's questline.
Complete all underwater location objectives.
Unveil all sub-regions of Greece.
Complete Xenia's questline.
Defeat all the Cultists of Kosmos.
Complete Episode 9 + Epilogue.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Complete Episode 7.
Complete the Olympic questline.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Upgrade the Adrestia to Legendary Status.
Defeat Medusa.
Defeat the Cyclops.
Reach Level 50.
Become Champion of the Arena.
Become the first Mercenary.
Outwit the Sphinx.
Perform an Overpower Attack with every weapon type.
Discover Atlantis and speak with Pythagoras.
Defeat the Minotaur.
Complete Episode 6.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Complete the Daughters of Artemis questline.
Complete Episode 5.
Acquire a Tier 3 active Ability.
Engrave a Legendary Item with a Legendary Effect.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat a Mercenary in the Arena.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
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.
Complete Episode 3.
Kill the Leader of any Region with Low Resources, other than Megaris.
Engrave your first item.
Acquire and equip your first Legendary item.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Spend the night with another character.
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
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.
Discover the truth about Darius' past
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill the Makedonian Lion
Kill 10 enemies using the Fury of the Bloodline Ability.
Kill 10 enemies using the Rapid Fire ability.
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill 10 enemies using the Death Veil ability
Complete The Heir of Memories
Complete One Really, Really Bad Day
Complete Divine Intervention.
Complete The Daughters of Lalaia
Complete Old Flames Burn Brighter
Complete A Brother's Seduction
Complete Every Story Has an Ending
Complete A Poet's Legacy.
Complete The Show Must Go On.
Complete The Image of Faith
Complete A Friend Worth Dying For
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
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.