Pure Pool

Once the snooker DLC is downloaded, the Snooker Breakpoint Challenge will be available under the Challenges tab in the menu.

Sinking red balls gives you additional time but no points, and sinking coloured balls gives you the normal amount of points for that colour (yellow 2, green 3, brown 4, blue 5, pink 6, black 7). Just like normal snooker, you must sink a red before you sink a colour. This means you have to sink at least 8 reds and 8 colours to get to 50 points.

For the break, I put the white next to the yellow, gave the white left spin, and kicked the white off the rail to hit the back of the pack of reds. Your goal is to break the pack of reds up nicely without sending too many of them past the blue line. With the right amount of power, this shot seems to achieve that most of the time. (Note: this is the same strategy I'm using on the break for the 147 achievement).

Also a tip: there's no use in sinking a red if you can't leave yourself with a shot on any colour. The only exception of course is if you are almost out of time. There is a 5 second penalty for fouls, but there's no penalty for missing. If you have a hard shot or are left in a bad position, it might be worth taking a shot or two to try to reposition.

Other than that, play quickly, play your shots with nice cue control (don't go smashing about the cue ball for no reason), play for the high valued colours (black, pink, and blue). 50 points isn't super easy, but it's not difficult, either. You can see in my video below, I missed a bunch and fouled a couple of times, and I still made it to 50 points, so there's lots of room for error. Good luck!