Full list of all 20 Assassin's Creed Pirates achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Windows Phone.
Destroy 1000 enemy ships
Reach 100% sync on La Habana
Unlock the Abyss
Reach 100% sync on Grand Bahama
Unlock the Fearless
Reach Level 20
Reach 100% sync on Los Mártires
Destroy 200 enemy ships
Complete 50 secondary missions
Reach 100% sync on Bahía de Guadiana
Reach 100% sync on Scorpion Reef
Unlock the Riptide
Reach Level 10
Find your first treasure
Complete 10 secondary missions
Fully upgrade one ship
Recruit your first crew member
Complete A Legend is Born
Unlock the Wanderer
Destroy your first enemy ship