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