Re: [RJ201002] [Royal] Trigger Happy 2 -DarkStriker-
Indeed, there are some secrets: The first special badge is for beating the game, as stated, and the third is for finding the hidden pirate treasure.
The second is for going through the final level again after beating it the first time and fighting the "secret but not very well hidden secret boss" GODES, who is like the secret boss from the last game except she makes me A LOT MORE UNCOMFORTABLE.
The last one I believe is for finding another secret boss and defeating him but, though I've found him I haven't beaten him yet. If you've beaten the game and defeated GODES, why not try looking around the start of level 2 a little? You may end up just as angry and frustrated as me.
Side note, if anybody could tell me how to clear the "challenge" for the first level (those five badges at the center of Dark Striker's stage select that light up "blue" when you've completed them), it'd be greatly appreciated. I THINK you have to collect all of the blue badge looking items (or most of them) in a stage but that doesn't seem to do it, so it might also be related to how quickly you clear the stage as well. I've done it for all but the first and fourth stages, currently, so whatever I did worked for the second, third and fifth ones. If anybody has also found how to unlock diary entries 18 and 20 I'd appreciate those, too. They're all I'm missing.
Edit 2: I was correct: The fourth badge is for defeating the second secret boss near the start of stage 2.
Edit: Also, for gun preferences, if you can unlock the very last pistol it's a six shot revolver with enemy penetration, high damage and a fast reload. I would highly recommend it for most situations.