Here is the full list of all 21 Trouble In The Manor achievements.
Kill over 250 players with a gun
Stab over 150 players to death
Kill over 400 players in total
Steal the souls of 100 victims
Flame over 50 players
Get DNA off of 50 bodies
Kill 15 Bloodhounds as a Murderer
Win over 25 rounds as a murderer
Find over 300 items
Kill over 25 players using poison traps
Win over 50 rounds as an innocent
Die over 100 times
Kill 40 Innocents as a Murderer
See what the dead say using a seance device
Kill 5 Vampires
Link a victim to a murderer with DNA
Play the piano
Become a Vampire
Play the Manor's secret chime
Survive a round with 100% health
Kill your first player