So I was on GraalOnline Classic earlier today, clicked on NiTe's profile and seen this:
When I clicked on the button it seemed to open up a whole new menu, and I could browse through them! NiTe achieved "Through Thick and Thin" for having over 100 hours on US tag, "Sparring Expert" for having over 10,000 spar wins, "Just Get A Toupee!" for having over 50 hats, "Better Luck Next Time" for losing in RPS over 100 times, "Skilled Player Killer" for having over 10,000 player kills, and the list goes on.
NiTe had achievements that he'd achieved on his own, and as part of a group/guild too, it was amazing. "Hold The Fort" for taking a guild fort with his fellow guild members, "Against All Odds" for being the last player alive on a guild spar team while being outnumbered AND winning, "Party Pooper" for closing his guild house while having over 20 players in it, AND "Best out of Three" for winning the GST over 3 times!
I then checked my own achievements, and apparently I suck because I only had "Just Get A Toupee!" but this is what it looked like when I clicked on it!
The best part? Nobody knew how to achieve the achievements, they were entirely secret, and some of them even gave out rewards such as gralats and hats.
Except this didn't happen. Therein lies my suggestion, make it so.