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