Didn’t play any more actual proper missions, as I needed to build up my respect bar before they were unlocked, so set about exploring instead. Found three CDs (I now have 10, so it unlocked a music track), and some tag points. Also found one of the cars I needed for a Chop Shop mission, and I spent a while doing hostage runs too.
I got another achievement today as well – 20 hours played. What was interesting is I was checking my stats to see how many tag points I had, and I saw my Time Played stat at 19 hours, 59 minutes and 59 seconds. Bizarre.