Gastronaut: Buy at least one of every food at the deli. (Yes, even the haggis.) This will cost you 61 pounds, so be prepared.
Hint 6
Golden Archer: Play at least seven rounds of archery. Sure makes me wish I had access to an archery range in real life.
Hint 7
Piper: Play the bagpipes at least eleven times. This doesn't have to be recognizable tunes or even actual notes; you can just honk if you want.
Hint 8
Souvenir: Buy every item in the souvenir machine, which will cost you around 250 pounds. They'll be in a green bag in your inventory afterwards, if you want to look at them.
Hint 9
Spoiler Free: Complete the game without using any spoilers. That is, you can read all the hints in the task list except the last one that just tells you the answer. Nice!
Hint 10
Spy: Put on the spy glasses 30 or more times. The easiest way to do this one is stand in some neutral spot and just click rapidly on the glasses to put them on and off rapidly.
Trivia Tamer: Correctly answer the trivia question at the end of the game.
Hint 13
Unlocker: Open all of the available lockers in the station. Some of them have red lights, which means someone else has engaged them, and you don't need to bother with those ones. Even so, this one will cost you 30 pounds.
Hint 14
Charmed (Bonus Edition Only): Find all seven of the phone charms in the game.