Xenia's Questline makes you use treasure maps to locate treasure items: Golden Feather of Ajax, Makedonian Bracelet, Triton's Shell of the Tides, Apollo's Lyre, Pan's Flute, Olouros Fortress Coffer.

Finding all Treasures and thus completing Xenia's questline unlocks A Pirate's Life For Me Trophy / Achievement.

The Questline starts on Keos. At the start of Story Sequence 7 you can do all of these!
You are given multiple treasure maps by Xenia but only one of them is correct. The way this normally works is that you check all maps in the inventory against your world map to track down which could be the real spot. This is a tedious process, so the video guide shows you where to go right away.

#1 - Golden Feather of Ajax - 1:30
#2 - Makedonian Bracelet - 5:26
#3 - Triton's Conch Shell of the Tides - 9:20
#4 - Pan's Flute - 15:21
#5 - Apollo's Lyre - 16:19
#6 - Olouros Fortress Coffer - 19:25

Text & Screenshot Guide: http://www.powerpyx.com/acod-xenias-treasure-map-locations-feather-bracelet-shell-flute-lyre-coffer/

Assassin's Creed Odyssey Trophy Guide & Roadmap: http://www.powerpyx.com/assassins-creed-odyssey-trophy-guide-roadmap/

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*Thanks to Ubisoft for providing a copy of the game.

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All Assassin's Creed Odyssey Trophies & Achievements:

Epic Cycle
Earn every trophy.

This is Sparta!
Complete the Battle of 300.

An Odyssey in the Making
Complete Episode 1.

Past Mistakes
Complete Episode 2.

Evil Unearthed
Complete Episode 3.

The Bright Minds
Complete Episode 4.

From the Ashes
Complete Episode 5.

Democracy Falls
Complete Episode 6.

Legend in the Making
Complete Episode 7.

Taking Back Athens
Complete Episode 8.

Odyssey's End
Complete Episode 9 + Epilogue.

Child of Poseidon
Complete all underwater location objectives.

Make It Your Own
Engrave your first item.

You Work for Me Now
Recruit and assign a Legendary NPC for your ship.

Shiny!
Acquire and equip your first Legendary item.

I am Legend
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.

Are You Not Entertained?
Become Champion of the Arena.

Demigod
Reach Level 50.

Godly Power
Acquire a Tier 3 active Ability.

Legacy Restored
Upgrade your Spear to Tier 6.

Top of the Food Chain
Become the first Mercenary.

The Cult Unmasked
Defeat all the Cultists of Kosmos.

Stink Eye
Recover the Cyclops's eye from a goat on Kephallonia.

Hermes's Homie
Unveil all sub-regions of Greece.

In Perseus's Image
Defeat Medusa.

A-maze-ing Victory!
Defeat the Minotaur.

Eye on the Prize
Defeat the Cyclops.

Riddle Me This
Outwit the Sphinx.

Lord of the Seas
Fully upgrade the Adestria.

The Argonauts
Fully crew the Adrestia with Legendary Lieutenants.

Master of the Hunt
Complete the Daughters of Artemis questline.

Everybody Benefits
Complete Markos's questline.

Trust Me, I'm a Doctor
Complete the Hippokrates questline.

A Pirate's Life for Me
Complete Xenia's questline.

Going For Gold
Complete the Olympic questline.

Scourge of the Aegean
Sink your first Epic Ship.

Blood Sport
Defeat a Mercenary in the Arena.

Harder, Better, Faster, Stronger
Upgrade the Adrestia for the first time.

Fashion's Creed
Equip a Legendary Armor set.

Aphrodite's Embrace
Spend the night with another character.

One Head Down…
Defeat a full cluster of Cultists of Kosmos.

Birthright
Discover Atlantis and speak with Pythagoras.

Ramming Speed
Cleave a ship in half.

I Have the Power
Perform an Overpower Attack with every weapon type.

War Master
Kill the Leader of any Region with Low Resources, other than Megaris.

Misthios in Training
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.

Island Hopper
Complete 20 Quests in Pephka, Obsidian and Abantis islands.

Infamous
Raise your Bounty to the maximum level.

Hero for Hire
Win your first on land conquest battle in any region (excluding Megaris).

Wrath of the Amazons
Cleave a ship while having an all-women crew.

The Midas Touch
Engrave a Legendary Item with a Legendary Effect.