This trophy can only be obtained on the expert version of Burglar. There are 16 figurines that must be collected from inside the house to complete this trophy. Note that it is significantly easier to get them by either killing or disabling the enemies.
For this challenge, there are a total of 10 enemies. There are 2 patrolling the outside, 2 on the first floor, 3 on the second floor (2 patrolling and 1 standing on the balcony outside), and 3 on the fourth floor.
You begin with 8 sleep darts, so I found it easiest to ignore the 2 enemies outside. Jump across the gap down the stairs from where you begin. Immediately turn right and work your way to the right and down to reach the side door. Once inside, use sleep darts on the 8 enemies before doing anything else and you can search the building at your leisure.
There are 5 figurines on the first floor, 4 on the second floor, 1 on the third floor, and 6 on the fourth floor.
Hastatus has a nice post with a video from XniresistX that details the exact locations HERE.