Here is the full list of all 52 Vendetta - there are Curse of Raven's Cry achievements.
Finish the game
Acquire a ship of the line
Kill Marcus
Save Marcus
Hire a full officer set
Kill 50 human enemies using Fear skill
Eliminate 50 human enemies silently
Successfully board 50 ships
Solve more than 100 quests
Purchase a warship
Get reward from English Ally
Get reward from French Ally
Prepare any tincture
Find Unicorn Horn (Narwhals Horn)
Naughty, naughty.
Purchase a frigate
Finish third chapter
Get Max reputation as a Pirate
Finish second chapter
Purchase a galeon
Fully upgrade the Serpent
Sink 40 small galeons
Destroy a ship during boarding
Eliminate 100 beasts
Burn 10 ships after boarding
Sink 50 schooners
Sink 30 frigates
Sink 10 warships
Release 10 ships after boarding
Win 10 games of dice
Collect 100 herbs
Purchase a small galeon
Purchase a schooner
Sink 20 galeons
Advance to level 25
Earn 100.000 reales from trading
Kill 25 human enemies using a knife
Use your Raven to steal something 100 times
Shoot 50 human enemies
Kill 100 human enemies on land
Advance to level 10
Kill 10 human enemies with explosions
Have more than 100 items in your inventory
Finish first chapter
Advance to level 5
Finish Tutorial
Blow yourself up.
Sink 500 ships
Collect 1.000.000 reales
Waste 50.000 cannon loads
Use 100.000 reales on ship repairs
Get reward from Spanish Ally