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