Here is the full list of all 27 Killer Frequency achievements.
Nobody survives The Whistling Man
Save all Whistling Man Targets
Reach the end of Whistling Night
Finish the game in under 4 hours with all callers surviving
Forrest Nash survived The Whistling Man
Peggy Weaver survived The Whistling Man
Teddy Gallows Jr survived The Whistling Man
Restore power to the station after the blackout
Jason Parker survived The Whistling Man
Play all radio ads during the course of the night
Unlock all doors in the station
Roller Ricky survived The Whistling Man
Play all records during the course of the night
Uncovered Clive's Research
Collect all hidden records around the station
Chuck Brody survived The Whistling Man
Place the mannequin head into the fridge
Gain access to the station after being locked out
All Teens (except Jimmy) survived The Whistling Man
Murphy survived The Whistling Man
Eugene Stine survived The Whistling Man
Virginia Sullivan survived The Whistling Man
Maurice Russell survived The Whistling Man
Sandra Sharpe survived The Whistling Man
Don't respond when prompted for 30 seconds
Deputy Martinez survived The Whistling Man
Play a sound on the soundboard during a call