This achievement is quite simple, and doesn't actually require an in depth collectable guide. By bringing up your map with the
button, the game will display any minds you
haven't scanned as a question mark on the map. Once you've scanned the mind, it will then display as an oval on the map. Using this you can go through a level while frequently checking the map to make sure you don't miss any minds.
If you do miss any, you can use the chapter select feature from the main menu to revisit the levels you need. The chapter select screen also displays how many minds you have and need for each level, making it easy to keep track of what you still need to collect.
EDIT - Thanks to UnsungGhost for pointing this out. You can exit a level as soon as you've collected any minds you've missed and they'll still be counted. Completing the level isn't necessary.