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