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 all underwater location objectives.
Unveil all sub-regions of Greece.
Recover the Cyclops's eye from a goat on Kephallonia.
Perform an Overpower Attack with every weapon type.
Complete Xenia's questline.
Complete Markos's questline.
Complete the Daughters of Artemis questline.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Upgrade your Spear to Tier 6.
Complete the Hippokrates questline.
Engrave a Legendary Item with a Legendary Effect.
Equip a Legendary Armor set.
Defeat all the Cultists of Kosmos.
Defeat the Minotaur.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Become the first Mercenary.
Defeat Medusa.
Upgrade the Adrestia to Legendary Status.
Complete Episode 9 + Epilogue.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 8.
Cleave a ship while having an all-women crew.
Become Champion of the Arena.
Complete Episode 7.
Raise your Bounty to the maximum level.
Complete the Olympic questline.
Reach Level 50.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete Episode 6.
Complete Episode 5.
Defeat the Cyclops.
Acquire a Tier 3 active Ability.
Defeat a Mercenary in the Arena.
Defeat a full cluster of Cultists of Kosmos.
Cleave a ship in half.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Episode 4.
Sink your first Epic Ship.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 3.
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.
Spend the night with another character.
Complete Episode 2.
Upgrade the Adrestia for the first time.
Acquire and equip your first Legendary item.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
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 Old Flames Burn Brighter
Complete Every Story Has an Ending
Complete One Really, Really Bad Day
Complete A Poet's Legacy.
Complete The Image of Faith
Complete The Show Must Go On.
Complete The Daughters of Lalaia
Complete The Heir of Memories
Complete Divine Intervention.
Complete A Friend Worth Dying For
Complete A Brother's Seduction
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.