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