Awesome game, the achievements are fairly challenging but only in terms of the time it takes to get them.
Though that last one can be difficult for some, but if you simply use the smallest hull and the best of everything else you can easily hit the 250k mark without a hint of damage if you're cautious (stop the second you see something you could possibly collide into, don't use boosts).
Great game, but the servers could need tweaking, too many people leave the games as they are starting- that you cannot control, but if it didn't disconnect or have an error so often the game would be more playable..other than that awesome game!