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