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