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.
Become the first Mercenary.
Defeat the Minotaur.
Outwit the Sphinx.
Reach Level 50.
Become Champion of the Arena.
Discover Atlantis and speak with Pythagoras.
Complete Episode 9 + Epilogue.
Complete Episode 8.
Defeat a Mercenary in the Arena.
Complete Episode 7.
Acquire a Tier 3 active Ability.
Defeat a full cluster of Cultists of Kosmos.
Fully crew the Adrestia with Legendary Lieutenants.
Equip a Legendary Armor set.
Complete the Olympic questline.
Sink your first Epic Ship.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Complete Episode 6.
Complete Episode 5.
Complete Episode 4.
Perform an Overpower Attack with every weapon type.
Engrave a Legendary Item with a Legendary Effect.
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.
Cleave a ship while having an all-women crew.
Complete Episode 3.
Spend the night with another character.
Raise your Bounty to the maximum level.
Upgrade the Adrestia for the first time.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 2.
Acquire and equip your first Legendary item.
Cleave a ship in half.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
Complete all underwater location objectives.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Recover the Cyclops's eye from a goat on Kephallonia.
Unveil all sub-regions of Greece.
Defeat Medusa.
Defeat the Cyclops.
Upgrade the Adrestia to Legendary Status.
Complete the Daughters of Artemis questline.
Complete Markos's questline.
Complete the Hippokrates questline.
Complete Xenia's questline.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Kill the Makedonian Lion
Secure your bloodline
Heal by parrying 10 times with the Judgment of the Lion.
Continue the bloodline.
Set 10 enemy ships on fire.
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
Discover the truth about Darius' past
Kill 10 enemies using the Fury of the Bloodline Ability.
Kill 10 enemies using the Rapid Fire ability.
Kill 10 enemies using the Death Veil ability
Kill all of the Ancients in the Order of the Storm in Achaia.
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 The Show Must Go On.
Complete Divine Intervention.
Complete The Image of Faith
Complete The Daughters of Lalaia
Complete A Poet's Legacy.
Complete A Brother's Seduction
Complete A Friend Worth Dying For
Complete The Heir of Memories
Complete One Really, Really Bad Day
Complete Every Story Has an Ending
Complete Old Flames Burn Brighter
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 Steropes the Lightning Bringer.
Defeat Arges, the Bright One