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