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