Here is a list of the known Pottermore badges and their descriptions.
'Read About' Badges
Book of Spells: Borrow Miranda Goshawk's Book of Spells from the restricted section (Book 1, Chapter 12, Moment 1)
*click for a larger image
Lock Picker: Use the hairpin to unlock the cupboard in Harry Potter and the Chamber of Secrets and collect the chocolate frog card.
Collect the hairpin from CoS, Chapter 4, Moment 4 (In the young blonde girls' hair and then return to CoS, Chapter 1, Moment 1. The cupboard under the stairs will be unlocked.