Here is the full list of all 20 Boo! Greedy Kid achievements.
Get all stars
Earn $5000
Get two third of all the stars
Hide behind a furtinure 100 times
Finish all levels
Finish two third of the main campaign
Get one third of all the stars
Shout on a SWAT
Get caught by a robot-cop
Get tased
Shout on 200 persons
Finish one third of the main campaign
Dodge roll 100 times
Finish a level with just one hearth remaining
Slam a door in the face of someone
Slam a door by rolling through it
KO a nurse
Finish your first level
Shout on your first victim
Taunt someone with your butt