Like WW2 pilots inspire the achievements in the "historical" category, Vinkman inspired this one for the "challenges" category, and naming it after him would be paying proper respect. No offense intended.
I haven't yet made up my mind if I intended as a joke only, or fully serious. It's just the solution on one extreme end for this situation.
The universe in the game has certain properties. And they are whatever they are chosen to be by the creator of the universe, within the limits of what is possible. Having an achievement that depends on some details simply is a statement that how things are is fully intended.
Alternatively, like some have suggested it to be an exploit, on top of the universe there might be additional "man-made" rules set up. It behaves in a certain way, but don't you dare to take any advantage of that, evil exploiter! If this starts at intentional one-sided ramming, where does it end? Any flying that works on one side, but is "incorrectly" (unbelievable, not "realistic", ...) transmitted would be in a similar category (pretending to crash might work - even if pulling out in time, it may look like flying into the ground on the other side, at least I remember having seen that once or twice). Will there be a rule-book of what flying you can do, and what's forbidden?
Then there's another alternative, to tell anyone who complains about "getting rammed" that they simply don't understand the underlying reasons and shall shut up due to stupidity.
Some advanced AI that decides whether or not, and if so who, gets damaged in a collision on one side or the other in a way that both parties can consider the result acceptable probably isn't within reach any time soon.
Of the different possibilities, having the achievement might not be so bad at all.