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