Here is the full list of all 28 Who is Abby achievements.
Completed Chapter 1
Completed Chapter 2
Completed Chapter 3
Completed Chapter 4
Completed Chapter 5
Completed Chapter 6
Completed Chapter 7
Completed Chapter 8
Completed Chapter 1 memory fragment
Completed Chapter 2 memory fragment
Completed Chapter 3 memory fragment
Completed Chapter 5 memory fragment
Completed Chapter 6 memory fragment
Completed Chapter 7 memory fragment
Completed Chapter 8 memory fragment
Found secret area 1
Found secret area 2
Found 50% of chess pieces
Found all chess pieces
Found the Stocksynd House magazine
Entered the museum for the first time
Scored a basket in Chapter 4
Got killed by the wolf
Listened to all the radio communications
Left the card in the card reader and returned to Room 8
Found all of the officers' login names
Completed Chapter 4 memory fragment
Found your first chess piece