the gold suit is all buyable clothes. from the aquaberry store, the punk store/barber shop, worn in, school store, and carnival. yes, carnival included.
after i got all 40 trophies (poster in the carnival is included in this) i had to return to the dorm to update it and get credit.
the boxing matches arent accessible till a certain time of day. i want to say 7, but im not sure. all i know is i stood next to the boxing ring for a few minutes while looking at the computer, and when i looked back the blue ring was on the gound.
after i got all of the stuff on thelist, i had to do 6 more errands for a total of 38. they were giving me .04% a piece. when i did the last one, i was at 99.98%, so the OP must have done something along the line different from me to get an additional .02% and skip an errand. :D
everyone that has done at least 38 errands and all things and nothave 100% iguess u are really missing something i did everything and 32 errends and had 99.86 % i did 4 errands and Achievement Unlocked easy as that..