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