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