Pirate badge is earned by winning treasure hint events. The more treasure hint events you win, the higher your badge level becomes.

• Completing 1 treasure hint event earns you the bronze badge.
• Completing 5 treasure hint events earns you the silver badge.
• Completing 20 treasure hint events earns you the gold badge.
• Completing 50 treasure hint events earns you the ruby badge.

Please click the following link for more details about the badges you can earn and their requirements:
https://blog.jawaker.com/jawakerbadges-en/