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