Win missions with 100% health and win missions without using bombs medals are all reversed (so you "earn" the health medals by not using bombs and vica-versa)
Boss medal unlocks after completing one of the early missions, not the 12th. That's okay. Better for it to be wrong and unlock early than be wrong and never unlock. You'll want to clear out all the stages to get all the medals anyway.
Master addicted medal is on the ridiculous side. Yes you literally have to keep coming back to the game every single day for an entire week. Finally got that one.