Gone Home: How to Find All Hidden Trophies/Achievements

Meow Meow Meow (Silver/100g)
Found Mitten’s secret diary.

This is probably the most complicated, but it’s quite simple if you know where to look. In the garage, there is a small purple basketball hidden in the rafters.

Grab any object, and throw it up there to knock it down.  Then, take the ball, bring it to Sam’s room, and shoot it through the basketball hoop behind her bedroom door.  Once you do, the lights will flicker, the TV will show a picture of cats, and you’ll hear the secret diary of Mittens the cat! This trophy/achievement will unlock right away.