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