Episode 3: Green With Envy
All of the achievements in this episode are interlocking, so the way to go without missing any of them:
Do Not Call Police. (At the start of the episode after your call with Yvette, you will get a choice between Munro and a cellphone. Choose Munro.)
When leaving the Radio Station, choose Munro (the female character) to interview the Headmistress.
During the interview, Choose the Whistle. [Part of: Blow Me]
After the interview, you will get a choice in locations.
Choose the Parent's House (House Icon at the Top).
Choose Whistle. [Part of: Blow Me]
You will automatically go to the Guesthouse (Bed Icon on the Right). Choose Miss Gallagher (Left Character). [Get Neighbourhood Watch here; more info here:]
Return to the Headmistress (School Icon on the Bottom Left). You will get a choice.
Choose Poe (the male character).