Here is the full list of all 29 Crazy Killer achievements.
Discover 5 killers using the Sixth Sense
Discover 5 killers with the detective Magnifying Glass
Win 3 rounds without any victim (eliminate the killer while he did not kill anybody)
Stay the last man in 30 rounds
Scare 20 players
Make 20 headshots
Make a photo of 5 different killers
Blind 10 killers with foam of extinguisher
Cure 20 players using a Doctor's syringe
Turn into zombie and tear 10 players
Find metal 30 times using a Metal Detector
Bash 10 killers
Resurrect 10 players with the help of a Nurse syringe
Use 25 'Badges of Civilian'
Perform 30 concerts
Draw 50 graffities
Eliminate the killer by shot from Bass
Make 10 killers puzzled
Heal yourself to 150 hp (with the aid of items)
Eliminate 10 killer (with items, bonus or found weapon)
Spend 100 rounds
Find 10 chests
Use 5 Marks of Murderer
Eliminate 10 killers
Eliminate the killer 10 times during the first minute of the round
Use 5 Signs of Sheriff
Eliminate 10 sheriffs
Win 5 rounds using only melee attacks
Eliminate 5 competitors killers