The Chapter 2: Family Secrets Add-on for Tell Me Why has 10 achievements worth 500 gamerscore.
Complete Episode Two
Make peace with Mary-Ann at the cemetery
Win the plushie battle
Find three classic posters
Discover intel about Mary-Ann's past and her death
Find a recording of the twins' 911 call
Correct the old graffiti on the tree
Figure out who inspired each Book of Goblin character
Prove to Tyler that moo boxes are actually funny
Stick a note on Tyler's back