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.
Upgrade the Adrestia to Legendary Status.
Complete Markos's questline.
Defeat Medusa.
Defeat all the Cultists of Kosmos.
Complete Episode 9 + Epilogue.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete Episode 7.
Complete the Olympic questline.
Become the first Mercenary.
Become Champion of the Arena.
Defeat a full cluster of Cultists of Kosmos.
Defeat the Minotaur.
Reach Level 50.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat a Mercenary in the Arena.
Complete the Daughters of Artemis questline.
Defeat the Cyclops.
Acquire a Tier 3 active Ability.
Equip a Legendary Armor set.
Complete Episode 6.
Complete Episode 5.
Raise your Bounty to the maximum level.
Complete Episode 4.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Cleave a ship while having an all-women crew.
Engrave a Legendary Item with a Legendary Effect.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Sink your first Epic Ship.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 3.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Engrave your first item.
Complete Episode 2.
Spend the night with another character.
Recruit and assign a Legendary NPC for your ship.
Acquire and equip your first Legendary item.
Upgrade the Adrestia for the first time.
Cleave a ship in half.
Complete Episode 1.
Complete the Battle of 300.
Complete all underwater location objectives.
Unveil all sub-regions of Greece.
Complete the Hippokrates questline.
Complete Xenia's questline.
Perform an Overpower Attack with every weapon type.
Kill the Makedonian Lion
Kill 10 enemies using the Death Veil ability
Discover the truth about Darius' past
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill 10 enemies using the Rapid Fire ability.
Set 10 enemy ships on fire.
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.
Kill 10 enemies using the Fury of the Bloodline Ability.
Secure your bloodline
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
Complete Every Story Has an Ending
Complete The Heir of Memories
Complete The Show Must Go On.
Complete Divine Intervention.
Complete The Image of Faith
Complete The Daughters of Lalaia
Complete A Poet's Legacy.
Complete A Brother's Seduction
Complete A Friend Worth Dying For
Complete One Really, Really Bad Day
Complete Old Flames Burn Brighter
Kill all Overseers in Elysium.
Remember who you are.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 1.
Win the conquest of Elysium with freed humans from the 3 main regions.
Defeat Cerberos.
Close all Tartaros Rifts.
Defeat all of the Fallen.
Collect all the Keeper's Insights in Episode 2.
Dethrone the king.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Completely fill the Knowledge Sequence.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Defeat the Hekatonchires.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.