Chapter 1 - Suzie, Do You Copy?
After you complete the Summer Fling quest for Karen and Billy.
*** Spoiler - click to reveal ***- Go to Pool in Hawkins Suburbs. Speak to Karen.
- Go to Starcourt Mall. Buy shampoo from Cheryl at Crimp Your Style on main floor.
- Get pretzel from Knot So Good on bottom floor.
- Go back to Pool. Give pretzel to Billy. Give Shampoo to Karen.
Complete Revenge of the Geeks quest for Susan and Chet.
*** Spoiler - click to reveal ***- Talk to Susan who's next to Karen.
- Chet asks for milk shake.
- Go to Scoops Ahoy in Starcourt Mall.
- Robin asks for Ultra-Lax and Shake Mix.
- Get Shake Mix from Scoops Ahoy back room.
- Go to Melvald's in Hawkins Square. Talk to Mr. Melvald.
- Clear rats from storage room. Get Ultra-Lax.
- Buy Hair Dryer from Mr. Melvald.
- Go back to Robin at Scoops Ahoy. Get Milk Shake. (She puts it on floor near you)
- Go back to Pool in Hawkins Suburbs.
- Give milk shake to Chet. (Have a laugh at his expense)
- Give hair dryer to Susan.
Achievement!