Probably my most niche-within-a-niche fascination, the visual and physical forms videogame-like achievement systems take are numerous and curious. TBC, have to add images. Videogame examples in italics.
So far, I've seen systems drawing on the forms of:
Badges
-Geocaching Badgegen badges
-Scouting badges
-various Wikipedia awards
-Animal Crossing: New Leaf
Embroidered patches
-Scouting badges
Stickers
Medals
-various Wikipedia awards
Medal ribbons (the kind used in militaries)
-ribbon forms of various Wikipedia awards
-Planetside
Ink stamps
-Tower Unite
Post stamps
-Club Penguin