Here is the full list of all 46 Vampire's Kiss achievements.
You completed Chapter 1.
You completed Chapter 2.
You completed Chapter 3.
You completed Chapter 4.
You completed Chapter 5.
You completed Chapter 6.
You completed Chapter 7.
You completed Chapter 8.
You obeyed the Thirst and drank from a human.
You fed on the alley cat.
You learned Marky didn't enjoy the 1990s.
You set London as your hometown.
You impersonated a doctor at the morgue.
You called in dead and your boss wasn't fooled.
You arrived at court dressed as a nurse.
Fergus told you his real name.
You impressed Fergus during your interview.
You faked your own death.
You fed on a bride-to-be.
You visited Klem.
You got Alex's interest and attention.
Marky makes an out-of-date TV reference.
You impersonated Alex's maid.
You impersonated a Hollywood star to visit Alex.
You had a romantic encounter at Matchlock Manor.
Alex felt betrayed and abandoned you.
You found Nemo!
You were helped by Zach Lock.
You killed Bill Boston at the earliest possible moment.
Fergus was killed.
Side with the rebels and do not kill the Sisters during your playthrough.
You impersonated Sam Jolley a second time.
You learned who turned Saffron into a vampire.
You became romantically involved with Marky.
You became romantically involved with Alex Hayward.
You became romantically involved with Saffron De Lisle.
You became romantically involved with Kurt Wilcox.
You saved London and returned the relics without using them.
You threw away a priceless item.
You cured yourself of vampirism.
You cured someone else of vampirism.
You turned Alex into a vampire.
You decided to rule the world alone.
You decided to rule the world with a partner.
You became a secret vampiric overlord.
You went for the belly.