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