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