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