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