With over 40 billion kilometers behind me, I can proudly say: It was a great journey!
I really like how it escalates and the sounds and surroundings create a nice atmosphere (I love the transition between day and night),
even with negative money ;)
And for all those who are curious: I still haven't reached the last achievement. With the penultimate achievement at 1 billion, I'm not sure if there is a last one at all. Maybe it's meant to say that even if it seems impossible, you have to keep moving forward ;)