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