The Flying Blind achievement in Solar 2 requires that you go from the Black Hole (under 150,000 mass, or basically a new basic spawn) up to the Big Crunch without the use of the Interface. The interface is triggered by the I key on the PC and not only is what turns the readout of your current mass on and off, but also means no more red indicators when there are nearby Black Holes that are larger than you.
The lack of having the red warning indicator causes two main complications which we will have to compensate for, first being that Black Holes significantly larger will now be a massive threat forcing us to find other means of detecting their nearby presence and second being that we cannot gain as much mass anymore from the rampant consumption of other Black Holes, having to avoid them more often for safety purposes.
First off we will have to eyeball any Black Holes we happen to get close enough to actually see, turning and running if they are any bigger then a speck, unless you are absolutely sure you’re the larger of the two. More often than not, you will want to avoid them since even so they can hide the presence of another larger black hole from the methods we will use to detect their presence.
In order to see Black Holes that may be nearby, make sure to turn on your path key (P) which you are allowed to use for the Flying Blind achievement. Try to see if there is some abnormal deviations in the pulls of nearby objects, and if you can see asteroids, planets or stars being pulled away from, chances are that’s a sign of a Black Hole with a stronger gravity well than yours, i.e., Bigger, time to run.
If you do happen to get caught in the pull of a large Black Hole, your best chance of escape is the slingshot method, requiring you to travel towards the Black Hole, but at an angle that sends you close enough that it’s pull combined with your acceleration will rocket you past it and out of its grasp.