Best way to get 30 medals offline, no weird spell builds needed:
Immediately after starting NG+, DON'T ACTIVATE ANY BONFIRES and run to majula and join CoC
Die/TP back with your feather to get back to the starting location and kill the 4 falcon hollows in the first area, all of the 3 falcon guys AND the bow one further back can drop the medals.
Use the jesters cap, gold serpent ring, prisoners tatters and watchdragon parma for higher dropchance - kill all, use feather, repeat
Took me 3-4 hours to get 30, it can be rough at times with the very low chance, but it's 10x better than royal campsite imo