I think I'm missing the following ones:
/r/nosleep
Ye Olde Explorer
Speed Racer
OOI, what does one have to do to get 'Stealth Mode Activated'? All I can think of is logging into the forum while in Incognito Mode.
Ye Olde Explorer - Sign in with Internet Explorer 6. So, you're running Windows XP? They never made a version for Windows Vista, Windows 7, Windows 8 or any Mac OS... Only reason I got it was I logged in from work on an ancient palmtop PC they keep around here. I did note, however, that the system "forgot" it last time we changed versions of forum software and Alex had to restore it manually. It's why he created this topic in the first place.
Speed Racer - Making two posts in less than 60 seconds. Which two posts? They're all time-stamped, after all.
/r/nosleep - Log into the forum between 2AM and 5AM PDT/PST. Not too hard, since this would be between 5AM and 8AM Eastern time in the US/Canada.
Stealth Mode Activated - the activating trigger for that is a secret, one which only Alex and Peuan would know, unless they've been blabbing, in which case there's be more people... There may not even be a trigger - it could be there as a decoy, a target that can never be hit... If you wanna be incognito, don't log in!
I should have speed racer, ye old explorer, and I believe arbiter. not 100 % though. Though either way I am going to go like 15 post so I should after that.
See above re Speed Racer, Ye Olde Explorer.
Arbiter - Give someone 15 positive/negative reputation in 24 hours. I did notice my rep suddenly shot up...
It has to be the same person's posts for all fifteen, but I suspect I was your target, so...
Oh, Alex... I'm missing a badge as well - Everybody Loves Raymond: Have someone love your posts 155 times. With a rep of 212, that has to have been reached by now...