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