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