mosk the bosses are the black ships that float by you have to beat each ship to get the next, when it popped up that i got it for mine its was the ship that was about 2 inches long, not sure if this is entirely accurate but thats how it worked for me
must say the most enjoyable 60 points i ever earned easy enough to complete in you day yet challenging enough to keep me hooked achievements were easy to obtain the hardest part was slowing down enough to earn all in game achievements on top of that advice to newer players dont worry to much about upgrading so early in the game like i did took alot out of the "challenge" to beating bosses half of the bosses seemed too easy compared to some of the training fights bc i upgraded to quickly all in all fantastic game awoke and garland 6.5/5