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 Xenia's questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete all underwater location objectives.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Fully crew the Adrestia with Legendary Lieutenants.
Defeat all the Cultists of Kosmos.
Unveil all sub-regions of Greece.
Complete Episode 9 + Epilogue.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Complete Episode 7.
Complete the Olympic questline.
Complete the Daughters of Artemis questline.
Raise your Bounty to the maximum level.
Defeat the Cyclops.
Defeat Medusa.
Complete the Hippokrates questline.
Upgrade the Adrestia to Legendary Status.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Complete Markos's questline.
Defeat the Minotaur.
Cleave a ship while having an all-women crew.
Become Champion of the Arena.
Defeat a Mercenary in the Arena.
Reach Level 50.
Acquire a Tier 3 active Ability.
Become the first Mercenary.
Equip a Legendary Armor set.
Defeat a full cluster of Cultists of Kosmos.
Complete Episode 6.
Complete Episode 5.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Cleave a ship in half.
Perform an Overpower Attack with every weapon type.
Complete Episode 4.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Sink your first Epic 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.
Upgrade the Adrestia for the first time.
Engrave a Legendary Item with a Legendary Effect.
Complete Episode 2.
Spend the night with another character.
Acquire and equip your first Legendary item.
Engrave your first item.
Recruit and assign a Legendary NPC for your ship.
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.
Set 10 enemy ships on fire.
Kill the Makedonian Lion
Acquire the Sword of Kings
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
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 Rapid Fire ability.
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 10 enemies using the Death Veil ability
Complete The Heir of Memories
Complete One Really, Really Bad Day
Complete Old Flames Burn Brighter
Complete Every Story Has an Ending
Complete The Image of Faith
Complete The Show Must Go On.
Complete A Friend Worth Dying For
Complete Divine Intervention.
Complete A Poet's Legacy.
Complete The Daughters of Lalaia
Complete A Brother's Seduction
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
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.
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.