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