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