Full list of all 12 Blood Knights trophies - 8 bronze, 3 silver and 1 gold. It takes around 8-10 hours to unlock all of the trophies on PlayStation 3.
3 human decisions made
Complete the game once
All Blood Coins collected
Suck 1000 litres of blood
3 vampiric decisions made
Roya stayed unharmed collecting the vampire blood
Kill 10 enemies by pushing them into a pit
Kill 10 enemies with an explosive barrel
Kill your coop partner with an explosive barrel twice
Play through any act with a coop partner
Kill one of your former friends
Revive your coop partner 10 times