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