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