DRAGON QUEST XI: Echoes of an Elusive Age

After finishing the story events at Gallopolis in Act 1 you will be given the Crackshot Crossbow key item. The Crackshot Crossbow allows you to target monsters on the field, that may be outside of your pre-emptive attack's reach to attract them to your location and initiate combat. Another use for the Crossbow is being able to hit small bullseye targets hidden all over Erdrea. Before starting this mission ensure you speak to the Crackshot Crossbow Master in Gallopolis located just South of the Gallopolis Palace. This will allow you to speak to Bodkin Archers who have set themselves up at campfires in any region that contains bullseyes and check on your progress or claim prizes for clearing the region.

To unlock this trophy you need to destroy all 55 bullseye targets in the game and then return to the Crackshot Crossbow Master for your last reward. The bullseyes are divided into five per region in the following regions.

• Gallopolis Region
• Laguna di Gondolia
• The Costa Valor
• The Manglegrove
• The Emerald Coast
• Zwaardsrust Region
• Dundrasil Region
• Sniflheim Region
• The Snaerfelt
• The Champs Sauvage
• Insula Islands

See the below video for an extremely detailed guide on hunting down each and every bullseye in the game. I advise opening the video in YouTube directly, to make use of the handy timestamps in the video description.