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