Here is the full list of all 13 Welcome to Hanwell achievements.
You found the piece of Isabelle Millers citizenship card in The Power Plant
You found the piece of Isabelle Millers citizenship card in The Doctor's House.
You killed your first enemy!
You found the UV flashlight attachment!
You found the piece of Isabelle Millers citizenship card in The Church!
You found the piece of Isabelle Millers citizenship card in The Jail!
You found the piece of Isabelle Millers citizenship card in The Hospital!
You found the piece of Isabelle Millers citizenship card in The School!
You found all the pieces and completed Isabelle Millers citizenship card.
You have gained access to the council!
You found all 100 strands of The Doctors DNA and discovered the secret beneath his house!
You killed over 100 Anomalies in the Arena!
You managed to slaughter 1000 Anomalies in the Arena! Your insane...