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