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