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Haha, you might actually be the first to find it! Did the second boss ship come down? Here's the playthrough, check at 58:30, it should give you the achievement when you complete the final boss: 

The Nurse achievement is in the final level, I'm not sure anyone's actually found it yet cause it's another secret ;)

Checking the source (cause I've since forgotten haha) it seems you get the Bigger Boss achievement also on the final level, did you walk to the right after destroying the walking boss?

Thanks for playing to the end! Really appreciate the review, hope you enjoy the soundtrack! :D

Here's a video of how to do the level! (I've grabbed the right time at the checkpoint, but if it doesn't work skip to 23:52! )

https://brilliance.itch.io/bme1

Harder than 'I Wanna Be The Boshy' with cuter graphics, great fun! :D