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