Treasure Collector

Treasure Collector is an achievement/trophy in the first Bayonetta game that is unlocked by finding half the Chests in the game.

Description
"Discover half the Umbra Witches' final resting places"

Guide
The wiki Walkthrough has the chest locations attached:

Chapter 1

Chapter 2

Chapter 3

Chapter 5

Chapter 6

Chapter 8

Chapter 9

Chapter 10

Chapter 12

Chapter 14

Chapter 15