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