Here is the full list of all 27 The Slater achievements.
Sabotage ventilation system
Trigger a car alarm
Complete level 3
Dress as lab worker
Shut down a metal detector
Complete level 2
Shoot a rat
Poison a drink
Sabotage all security cameras in a level
Start a lawn mower
Get party invitation without a kill
Complete level 1
Kill a junkie
Complete level 4
Complete level 5
Complete the game
Enter a secret observation room
Chat with street bum
Trigger police station upstairs alarm
Kill a rat
Shoot a bird
Complete level 1 as Master
Complete level 2 as Master
Complete level 3 as Master
Complete level 4 as Master
Complete level 5 as Master
Complete level 6 as Master