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