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