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